arm64: mm: Remove unused header file

Many header files are never used, let's remove them directly.

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Link: https://lore.kernel.org/r/1611663884-43329-1-git-send-email-zhangshaokun@hisilicon.com


Signed-off-by: Will Deacon <will@kernel.org>