add CPU_CORE for all family

hw/bsp/lpc54/family.mk

@@ -2,14 +2,10 @@ SDK_DIR = hw/mcu/nxp/mcux-sdk
 DEPS_SUBMODULES += $(SDK_DIR) lib/CMSIS_5
 
 include $(TOP)/$(BOARD_PATH)/board.mk
+CPU_CORE ?= cortex-m4
 
 CFLAGS += \
   -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m4 \
-  -mfloat-abi=hard \
-  -mfpu=fpv4-sp-d16 \
   -DCFG_TUSB_MCU=OPT_MCU_LPC54XXX \
   -DCFG_TUSB_MEM_ALIGN='__attribute__((aligned(64)))'
 
@@ -49,6 +45,3 @@ INC += \
 	$(TOP)/$(SDK_DIR)/drivers/lpc_gpio
 
 SRC_S += $(MCU_DIR)/gcc/startup_$(MCU_CORE).S
-
-# For freeRTOS port source
-FREERTOS_PORTABLE_SRC = $(FREERTOS_PORTABLE_PATH)/ARM_CM4F