arch: arm: mmu: allow to select the K_MEM_ARM_NORMAL_NC memory type

Allow to configure the MMU for non-cacheable normal memories.
This mode is needed for instance by net samples to access to
to non word-aligned memory.

Signed-off-by: Arnaud Pouliquen <[email protected]>

Author: arnopo

arch/arm/core/mmu/arm_mmu.c

@@ -890,6 +890,9 @@ static int __arch_mem_map(void *virt, uintptr_t phys, size_t size, uint32_t flag
 
 	switch (flags & K_MEM_CACHE_MASK) {
 
+	case K_MEM_ARM_NORMAL_NC:
+		conv_flags |= MT_NORMAL;
+		break;
 	case K_MEM_CACHE_NONE:
 	default:
 		conv_flags |= MT_DEVICE;