Commit f72df138 got rid of the use of PcdCacheEnabled, but failed to
actually drop it as a dependency for BeagleBoardLib.
Get rid of it, so the module will still build when the Pcd is _really_
removed.
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>