Add the missing IMAGE_FILE_MACHINE_ARM64 and IMAGE_DEBUG_TYPE_CODEVIEW
definitions.

We'll need them for the arm64 EFI stub...
Signed-off-by: NMark Rutland <mark.rutland@arm.com>
[ardb: add IMAGE_DEBUG_TYPE_CODEVIEW as well]
Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>