arm64: remove unused asm/compiler.h header file

arm64 does not define CONFIG_HAVE_ARCH_COMPILER_H, nor does it keep
anything useful in its copy of asm/compiler.h, so let's remove it
before anybody starts using it.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>