samd: Consolidate small build optimization flags

.. inline-unit-growth was the same across all boards, and the highest
max-inline-insns-auto parameter was shared across 2 of 5 boards, so it's
worth a little work to follow the DRY principle

Author: jepler

ports/atmel-samd/Makefile

@@ -125,6 +125,10 @@ else
 
   CFLAGS += -flto -flto-partition=none
 
+  ifeq ($(CIRCUITPY_SMALL_BUILD),1)
+    CFLAGS += --param inline-unit-growth=15 --param max-inline-insns-auto=20
+  endif
+
   ifdef CFLAGS_BOARD
     CFLAGS += $(CFLAGS_BOARD)
   endif

ports/atmel-samd/boards/pewpew10/mpconfigboard.mk

@@ -24,4 +24,4 @@ SUPEROPT_GC = 0
 
 FROZEN_MPY_DIRS += $(TOP)/frozen/pew-pewpew-standalone-10.x
 
-CFLAGS_BOARD = --param inline-unit-growth=15 --param max-inline-insns-auto=15
+CFLAGS_BOARD = --param max-inline-insns-auto=15

ports/atmel-samd/boards/pirkey_m0/mpconfigboard.mk

@@ -30,4 +30,4 @@ FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_DotStar
 FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_HID
 FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_IRRemote
 
-CFLAGS_BOARD = --param inline-unit-growth=15 --param max-inline-insns-auto=12
+CFLAGS_BOARD = --param max-inline-insns-auto=12

ports/atmel-samd/boards/pyruler/mpconfigboard.mk

@@ -13,4 +13,4 @@ CIRCUITPY_SMALL_BUILD = 1
 
 SUPEROPT_GC = 0
 
-CFLAGS_BOARD = --param inline-unit-growth=15 --param max-inline-insns-auto=15
+CFLAGS_BOARD = --param max-inline-insns-auto=15

ports/atmel-samd/boards/trinket_m0/mpconfigboard.mk

@@ -12,5 +12,3 @@ LONGINT_IMPL = NONE
 CIRCUITPY_SMALL_BUILD = 1
 
 SUPEROPT_GC = 0
-
-CFLAGS_BOARD = --param inline-unit-growth=15 --param max-inline-insns-auto=20

ports/atmel-samd/boards/uchip/mpconfigboard.mk

@@ -10,5 +10,3 @@ CHIP_FAMILY = samd21
 INTERNAL_FLASH_FILESYSTEM = 1
 LONGINT_IMPL = NONE
 CIRCUITPY_SMALL_BUILD = 1
-
-CFLAGS_BOARD = --param inline-unit-growth=15 --param max-inline-insns-auto=20