zephyr/mpconfigport_minimal: Use MICROPY_CONFIG_ROM_LEVEL_MINIMUM.

This commit adjusts the configuration of the minimal zephyr build to use
MICROPY_CONFIG_ROM_LEVEL_MINIMUM.  That's a lot cleaner than explicitly
enabling/disabling options.

Prior to this change the minimal build for qemu_cortex_m3 had size:

    Memory region         Used Size  Region Size  %age Used
               FLASH:      114436 B       256 KB     43.65%
                 RAM:       26320 B        64 KB     40.16%

and had the following test results (running using the CI settings, ie
`-d basics float --exclude inf_nan_arith`):

    352 tests performed (7092 individual testcases)
    352 tests passed
    254 tests skipped: ...

With the changes here the qemu_cortex_m3 size is now:

    Memory region         Used Size  Region Size  %age Used
               FLASH:       99428 B       256 KB     37.93%
                 RAM:       26312 B        64 KB     40.15%

That's a good decrease of about 15k firmware size.  And the test suite
still passes with:

    342 tests performed (6776 individual testcases)
    341 tests passed
    265 tests skipped: ...

Signed-off-by: Damien George <[email protected]>

Author: dpgeorge

ports/zephyr/mpconfigport_minimal.h

@@ -30,41 +30,36 @@
 // Included here to get basic Zephyr environment (macros, etc.)
 #include <zephyr/kernel.h>
 
+// Use the minimum configuration level to get a small but useful system.
+#ifndef MICROPY_CONFIG_ROM_LEVEL
+#define MICROPY_CONFIG_ROM_LEVEL (MICROPY_CONFIG_ROM_LEVEL_MINIMUM)
+#endif
+
 // Usually passed from Makefile
 #ifndef MICROPY_HEAP_SIZE
 #define MICROPY_HEAP_SIZE (16 * 1024)
 #endif
 
+#define MICROPY_ENABLE_COMPILER     (1)
+#define MICROPY_ENABLE_EXTERNAL_IMPORT (1)
 #define MICROPY_STACK_CHECK         (1)
 #define MICROPY_ENABLE_GC           (1)
 #define MICROPY_HELPER_REPL         (1)
 #define MICROPY_REPL_AUTO_INDENT    (1)
 #define MICROPY_KBD_EXCEPTION       (1)
-#define MICROPY_CPYTHON_COMPAT      (0)
-#define MICROPY_PY_ASYNC_AWAIT      (0)
-#define MICROPY_PY_ATTRTUPLE        (0)
-#define MICROPY_PY_BUILTINS_ENUMERATE (0)
-#define MICROPY_PY_BUILTINS_FILTER  (0)
-#define MICROPY_PY_BUILTINS_MIN_MAX (0)
-#define MICROPY_PY_BUILTINS_PROPERTY (0)
-#define MICROPY_PY_BUILTINS_RANGE_ATTRS (0)
-#define MICROPY_PY_BUILTINS_REVERSED (0)
-#define MICROPY_PY_BUILTINS_SET     (0)
-#define MICROPY_PY_BUILTINS_SLICE   (0)
-#define MICROPY_PY_ARRAY            (0)
-#define MICROPY_PY_COLLECTIONS      (0)
-#define MICROPY_PY_CMATH            (0)
-#define MICROPY_PY_IO               (0)
-#define MICROPY_PY_STRUCT           (0)
-#define MICROPY_PY_SYS_MODULES      (0)
 #define MICROPY_LONGINT_IMPL (MICROPY_LONGINT_IMPL_LONGLONG)
 #define MICROPY_FLOAT_IMPL (MICROPY_FLOAT_IMPL_FLOAT)
 #define MICROPY_PY_BUILTINS_COMPLEX (0)
 
-// Saving extra crumbs to make sure binary fits in 128K
-#define MICROPY_COMP_CONST_FOLDING  (0)
-#define MICROPY_COMP_CONST (0)
-#define MICROPY_COMP_DOUBLE_TUPLE_ASSIGN (0)
+// These features are enabled to get the test suite passing.
+#define MICROPY_FULL_CHECKS         (1)
+#define MICROPY_BUILTIN_METHOD_CHECK_SELF_ARG (1)
+#define MICROPY_MULTIPLE_INHERITANCE (1)
+#define MICROPY_PY_ASSIGN_EXPR      (1)
+#define MICROPY_PY_BUILTINS_STR_OP_MODULO (1)
+#define MICROPY_PY_BUILTINS_BYTEARRAY (1)
+#define MICROPY_PY_BUILTINS_DICT_FROMKEYS (1)
+#define MICROPY_PY_SYS              (1)
 
 #ifdef CONFIG_BOARD
 #define MICROPY_HW_BOARD_NAME "zephyr-" CONFIG_BOARD