mb/google/skyrim: Enable ASPM

Enable Kconfig options for ASPM.

TEST=Verify ASPM is enabled with `lspci -vvv`, `suspend_stress_test -c
10` passed all 10 times
BUG=b:243771794

Signed-off-by: Fred Reitberger <reitbergerfred@gmail.com>
Change-Id: I54071d9c9607da4561d745d152924d56904c0fee
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67444
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>

src/mainboard/google/skyrim/Kconfig

@@ -38,6 +38,10 @@ config BOARD_SPECIFIC_OPTIONS
 	select SOC_AMD_MENDOCINO
 	select SOC_AMD_COMMON_BLOCK_USE_ESPI
 	select TPM_GOOGLE_TI50
+	select PCIEXP_ASPM
+	select PCIEXP_CLK_PM
+	select PCIEXP_COMMON_CLOCK
+	select PCIEXP_L1_SUB_STATE
 
 config CHROMEOS
 	select EC_GOOGLE_CHROMEEC_SWITCHES