efi: arm: force use of unsigned type for EFI_PHYS_ALIGN

Ensure that EFI_PHYS_ALIGN is an unsigned type, to prevent spurious
warnings from the type checks in the definition of the max() macro.

Link: https://lore.kernel.org/linux-efi/20201213151306.73558-1-ardb@kernel.orgSigned-off-by: Ard Biesheuvel <ardb@kernel.org>

arch/arm/include/asm/efi.h

@@ -71,7 +71,7 @@ static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
  * here throws off the memory allocation logic, so let's use the lowest power
  * of two greater than 2 MiB and greater than TEXT_OFFSET.
  */
-#define EFI_PHYS_ALIGN		max(SZ_2M, roundup_pow_of_two(TEXT_OFFSET))
+#define EFI_PHYS_ALIGN		max(UL(SZ_2M), roundup_pow_of_two(TEXT_OFFSET))
 
 /* on ARM, the initrd should be loaded in a lowmem region */
 static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr)