arm64: use linux/sizes.h for constants

Use linux/size.h to improve code readability.
Signed-off-by: NMiles Chen <miles.chen@mediatek.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>

arch/arm64/kernel/process.c

@@ -407,7 +407,7 @@ unsigned long arch_align_stack(unsigned long sp)
 unsigned long arch_randomize_brk(struct mm_struct *mm)
 {
 	if (is_compat_task())
-		return randomize_page(mm->brk, 0x02000000);
+		return randomize_page(mm->brk, SZ_32M);
 	else
-		return randomize_page(mm->brk, 0x40000000);
+		return randomize_page(mm->brk, SZ_1G);
 }