stm32: Simplify D-cache clean and invalidate macros.

The inline functions that these are wrappers around already account for
cache line size.

Signed-off-by: Angus Gratton <angus@redyak.com.au>

ports/stm32/mpconfigboard_common.h

@@ -632,12 +632,12 @@
 
 // D-cache clean/invalidate helpers
 #if __DCACHE_PRESENT == 1
-#define MP_HAL_CLEANINVALIDATE_DCACHE(addr, size) \
-    (SCB_CleanInvalidateDCache_by_Addr((uint32_t *)((uint32_t)addr & ~0x1f), \
-    ((uint32_t)((uint8_t *)addr + size + 0x1f) & ~0x1f) - ((uint32_t)addr & ~0x1f)))
-#define MP_HAL_CLEAN_DCACHE(addr, size) \
-    (SCB_CleanDCache_by_Addr((uint32_t *)((uint32_t)addr & ~0x1f), \
-    ((uint32_t)((uint8_t *)addr + size + 0x1f) & ~0x1f) - ((uint32_t)addr & ~0x1f)))
+// Note: The SCB_Clean<...> functions automatically align their arguments to cover full cache lines.
+// CLEANINVALIDATE will write back (flush) any dirty lines in this region to RAM, then
+// invalidate (evict) the whole region from the cache.
+#define MP_HAL_CLEANINVALIDATE_DCACHE(addr, size) SCB_CleanInvalidateDCache_by_Addr((volatile void *)(addr), (size))
+// CLEAN will write back (flush) any dirty lines in this region to RAM.
+#define MP_HAL_CLEAN_DCACHE(addr, size) SCB_CleanDCache_by_Addr((volatile void *)(addr), (size))
 #else
 #define MP_HAL_CLEANINVALIDATE_DCACHE(addr, size)
 #define MP_HAL_CLEAN_DCACHE(addr, size)