Merge pull request #2480 from hathach/fix-k32l2-clock

add clock_config.c/h from mcux to frdmk32l2a4 and frdm_k32l2b

Author: hathach

hw/bsp/kinetis_k32l2/boards/frdm_k32l2a4s/board.mk

@@ -8,9 +8,6 @@ CFLAGS += -Wno-error=unused-parameter -Wno-error=redundant-decls -Wno-error=cast
 # All source paths should be relative to the top level.
 LD_FILE = $(MCU_DIR)/gcc/K32L2A41xxxxA_flash.ld
 
-SRC_C += \
-	$(MCU_DIR)/project_template/clock_config.c \
-
 # For flash-jlink target
 JLINK_DEVICE = K32L2A41xxxxA