CoffeelakeSiliconPkg: Add SiliconInitLib

SiliconInitLib contains Silicon Init APIs that can be reused
by BoardInitLib. It is expected that several implementations
of BoardInitLib exist for a given SOC, these APIs allow the
various BoardInitLib implementations to reuse common silicon
initialization code. This matches the implementation already
found in KabylakeSiliconPkg. This change also adds halting
the TCO watch dog timer to PEI, which was previously done in SEC.

Cc: Chasel Chiu <chasel.chiu@intel.com>
Cc: Michael Kubacki <michael.a.kubacki@intel.com>
Cc: Sai Chaganty <rangasai.v.chaganty@intel.com>
Signed-off-by: Nate DeSimone <nathaniel.l.desimone@intel.com>
Reviewed-by: Chasel Chiu <chasel.chiu@intel.com>
Reviewed-by: Michael Kubacki <michael.a.kubacki@intel.com>
Reviewed-by: Sai Chaganty <rangasai.v.chaganty@intel.com>