Commit e537d878 meant to, but failed to, remove PcdCacheEnable.
Address this, and get rid of this obsolete flag.
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>