arch: arm: use CMSIS defines for MPU_RBAR register bit setting

This commit removes the macro definitions for MPU_RBAR register
bitmasks, defined in arm_mpu.h, and modifies the MPU driver to
directly use the equivalent macros defined in ARM CMSIS.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>

arch/arm/core/cortex_m/mpu/arm_mpu.c

@@ -110,8 +110,8 @@ static void _region_init(u32_t index, u32_t region_addr,
 	/* Select the region you want to access */
 	ARM_MPU_DEV->rnr = index;
 	/* Configure the region */
-	ARM_MPU_DEV->rbar = (region_addr & REGION_BASE_ADDR_MASK)
-				| REGION_VALID | index;
+	ARM_MPU_DEV->rbar = (region_addr & MPU_RBAR_ADDR_Msk)
+				| MPU_RBAR_VALID_Msk | index;
 	ARM_MPU_DEV->rasr = region_attr | REGION_ENABLE;
 	SYS_LOG_DBG("[%d] 0x%08x 0x%08x", index, region_addr, region_attr);
 }
@@ -200,7 +200,7 @@ static inline int _is_in_region(u32_t r_index, u32_t start, u32_t size)
 	u32_t r_addr_end;
 
 	ARM_MPU_DEV->rnr = r_index;
-	r_addr_start = ARM_MPU_DEV->rbar & REGION_BASE_ADDR_MASK;
+	r_addr_start = ARM_MPU_DEV->rbar & MPU_RBAR_ADDR_Msk;
 	r_size_lshift = ((ARM_MPU_DEV->rasr & REGION_SIZE_MASK) >>
 			REGION_SIZE_OFFSET) + 1;
 	r_addr_end = r_addr_start + (1 << r_size_lshift) - 1;

include/arch/arm/cortex_m/mpu/arm_mpu.h

@@ -35,11 +35,6 @@ struct arm_mpu {
 
 #define ARM_MPU_BASE	0xE000ED90
 
-#define REGION_VALID	(1 << 4)
-/* ARM MPU RBAR Register */
-/* Region base address mask */
-#define REGION_BASE_ADDR_MASK	0xFFFFFFE0
-
 /* ARM MPU RASR Register */
 /* Region enable bit offset */
 #define REGION_ENABLE_OFFSET	(0)