TigerlakeSiliconPkg/SpiSmm: Update for SPI2 Protocol

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=3307



Updates references to the "PCH_SPI_PROTOCOL" to instead refer to
"PCH_SPI2_PROTOCOL".

Cc: Rangasai V Chaganty <rangasai.v.chaganty@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Heng Luo <heng.luo@intel.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Nate DeSimone <nathaniel.l.desimone@intel.com>
Reviewed-by: Heng Luo <heng.luo@intel.com>