UPSTREAM: arm64: kaslr: support randomized module area with KASAN_VMALLOC

After KASAN_VMALLOC works in arm64, we can randomize module region
into vmalloc area now.

Test:
	VMALLOC area ffffffc010000000 fffffffdf0000000

	before the patch:
		module_alloc_base/end ffffffc008b80000 ffffffc010000000
	after the patch:
		module_alloc_base/end ffffffdcf4bed000 ffffffc010000000

	And the function that insmod some modules is fine.

Suggested-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Lecopzer Chen <lecopzer.chen@mediatek.com>
Link: https://lore.kernel.org/r/20210324040522.15548-5-lecopzer.chen@mediatek.com


Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

Bug: 201711661
(cherry picked from commit 31d02e7a)
Signed-off-by: Yee Lee <yee.lee@mediatek.com>
Change-Id: I513f205113752b396245e9e8d64b973fcd7ffcb1