Silicon/AMD/Styx: move B1 revision peripherals to separate SSDT table

Instead of poking DSDT _STA method bytecode to make it return something
else depending on whether we are running on B1 silicon, move the B1 only
peripherals to a separate SSDT and only install it when running on
compatible hardware.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>