Add support for DSM methods as per the connectivity document
559910_Intel_Connectivity_Platforms_BIOS_Guidelines_Rev6_4.pdf
BUG=b:191720858
TEST=Check the generated SSDT tables for DSM methods
Change-Id: Ie154edf188531fe6c260274edaa694cf3b3605d3
Signed-off-by: Sugnan Prabhu S <sugnan.prabhu.s@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56751
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>