efi_loader: disable GRUB_ARM32_WORKAROUND on ARCH_SUNXI

GRUB_ARM32_WORKAROUND can be disabled on ARCH_SUNXI as the Allwinner SoCs
only have a level 2 cache controlled via CP15 and not an architecturally
defined cache. Having the cache available speeds up booting Linux.

On ARCH_BCM283X it is already disabled via rpi_2_defconfig. But let's move
this setting to Kconfig.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index e729f72..634d3b1 100644
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -281,7 +281,7 @@
 
 config EFI_GRUB_ARM32_WORKAROUND
 	bool "Workaround for GRUB on 32bit ARM"
-	default n if ARCH_QEMU
+	default n if ARCH_BCM283X || ARCH_SUNXI || ARCH_QEMU
 	default y
 	depends on ARM && !ARM64
 	help