[review] core: arm: enable CFG_BOOT_MEM unconditionally

Update.

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

core/arch/arm/kernel/boot.c

@@ -937,7 +937,7 @@ static void init_primary(unsigned long pageable_part, unsigned long nsec_entry)
 	core_mmu_save_mem_map();
 	core_mmu_init_phys_mem();
 	va = boot_mem_release_unused();
-	if (IS_ENABLED(CFG_ARM32_core) && !IS_ENABLED(CFG_WITH_PAGER)) {
+	if (!IS_ENABLED(CFG_WITH_PAGER)) {
 		/*
 		 * We must update boot_cached_mem_end to reflect the memory
 		 * just unmapped by boot_mem_release_unused().