separate iar and gcc build for clean make, also add cpu specific make

hw/bsp/stm32h7/family.mk

@@ -6,6 +6,7 @@ ST_CMSIS = hw/mcu/st/cmsis_device_$(ST_FAMILY)
 ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
 
 include $(TOP)/$(BOARD_PATH)/board.mk
+CPU_CORE ?= cortex-m7
 
 # --------------
 # Compiler Flags
@@ -29,20 +30,11 @@ endif
 # GCC Flags
 GCC_CFLAGS += \
   -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m7 \
-  -mfloat-abi=hard \
-  -mfpu=fpv5-d16 \
   -nostdlib -nostartfiles
 
 # suppress warning caused by vendor mcu driver
 GCC_CFLAGS += -Wno-error=maybe-uninitialized -Wno-error=cast-align -Wno-error=unused-parameter
 
-# IAR Flags
-IAR_CFLAGS += --cpu cortex-m7 --fpu VFPv5_D16
-IAR_ASFLAGS += --cpu cortex-m7 --fpu VFPv5_D16
-
 # -----------------
 # Sources & Include
 # -----------------
@@ -66,6 +58,3 @@ INC += \
 	$(TOP)/lib/CMSIS_5/CMSIS/Core/Include \
 	$(TOP)/$(ST_CMSIS)/Include \
 	$(TOP)/$(ST_HAL_DRIVER)/Inc
-
-# For freeRTOS port source
-FREERTOS_PORTABLE_SRC = $(FREERTOS_PORTABLE_PATH)/ARM_CM7/r0p1