Platform D03/D05: Remove EmuVariableRuntimeDxe including

For https://bugzilla.tianocore.org/show_bug.cgi?id=1323

,
EmuVariable will be merged to real variable driver, and
EmuVariableRuntimeDxe will be removed finally.

As D03 and D05 are using the real variable driver VariableRuntimeDxe,
this patch removes EmuVariableRuntimeDxe including in D03.dsc and
D05.dsc directly.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>