makes/armv7m: update KERNEL_TARGET_DEFINE

In place of old CPU_*, build system delivers __CPU_* and __TARGET_*
that is the cause of removal of CPU_* from KERNEL_TARGET_DEFINE.

JIRA: RTOS-519

Makefile.armv7m

@@ -30,24 +30,24 @@ endif
 ifeq ($(TARGET_SUBFAMILY), stm32l152xd)
 	RAM_SIZE=48
 	VADDR_KERNEL_INIT=0800d000
-	KERNEL_TARGET_DEFINE=-DCPU_STM32L152XD -DNOMMU
+	KERNEL_TARGET_DEFINE=-DNOMMU
 else ifeq ($(TARGET_SUBFAMILY), stm32l152xe)
 	RAM_SIZE=80
 	VADDR_KERNEL_INIT=0800d000
-	KERNEL_TARGET_DEFINE=-DCPU_STM32L152XE -DNOMMU
+	KERNEL_TARGET_DEFINE=-DNOMMU
 else ifeq ($(TARGET_SUBFAMILY), stm32l4x6)
 	RAM_SIZE=320
 	VADDR_KERNEL_INIT=0800d000
-	KERNEL_TARGET_DEFINE=-DCPU_STM32L4X6 -DNOMMU
+	KERNEL_TARGET_DEFINE=-DNOMMU
 else ifeq ($(TARGET_SUBFAMILY), imxrt105x)
 	VADDR_KERNEL_INIT=0
-	KERNEL_TARGET_DEFINE=-DCPU_IMXRT105X -DNOMMU
+	KERNEL_TARGET_DEFINE=-DNOMMU
 else ifeq ($(TARGET_SUBFAMILY), imxrt106x)
 	VADDR_KERNEL_INIT=0
-	KERNEL_TARGET_DEFINE=-DCPU_IMXRT106X -DNOMMU
+	KERNEL_TARGET_DEFINE=-DNOMMU
 else ifeq ($(TARGET_SUBFAMILY), imxrt117x)
 	VADDR_KERNEL_INIT=0
-	KERNEL_TARGET_DEFINE=-DCPU_IMXRT117X -DNOMMU
+	KERNEL_TARGET_DEFINE=-DNOMMU
 else
 	$(error Incorrect TARGET.)
 endif