Silicon/Hisilicon/Setup: Support SPCR table switch
If install SPCR table, KVM will not output while install or boot
some OS, like ubuntu, so add SPCR switch setup item and set it
disable by default.
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ming Huang <ming.huang@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>