include/sys/util: Fix WAIT_FOR for POSIX_ARCH

WAIT_FOR is a busy wait loop, which in the POSIX ARCH
should include a very minor delay in each iteration.

After this fix, tests/lib/sys_util does not need to
exclude native_posix anymore.

Signed-off-by: Alberto Escolar Piedras <[email protected]>

Author: aescolar

include/zephyr/sys/util.h

@@ -617,6 +617,7 @@ char *utf8_lcpy(char *dst, const char *src, size_t n);
 		uint32_t start = k_cycle_get_32();                                                 \
 		while (!(expr) && (cycle_count > (k_cycle_get_32() - start))) {                    \
 			delay_stmt;                                                                \
+			Z_SPIN_DELAY(10);                                                          \
 		}                                                                                  \
 		(expr);                                                                            \
 	})

tests/lib/sys_util/testcase.yaml

@@ -1,4 +1,3 @@
 tests:
   libraries.sys_util:
-    platform_exclude: native_posix native_posix_64
     tags: sys_util