ArmVirtPkg: avoid relocated immediates in AARCH64 asm

ArmVirtPkg: avoid relocated immediates in AARCH64 asm

The relocated immediate notation supported by GNU as (e.g., #:lo12:foo)
is not supported by clang. Since we are loading a constant value, they
were not entirely appropriate here anyway, so simply replace them with
assembler arithmetic expressions.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Laszlo Ersek <lersek@redhat.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18202 6f19259b-4bc3-4df7-8a09-765794883524