soc/amd/mendocino: Enable GPP clk req disabling for disabled devices

Enable GPP clk req disabling for disabled PCIe devices. If a clk req
line is enabled for a PCIe device that is not actually present and
enabled then the L1SS could get confused and cause issues with
suspending the SoC.

BUG=b:250009974
TEST=Ran on skyrim proto device, verified that clk reqs are set
appropriately

Change-Id: I6c840f2fa3f9358f58c0386134d23511ff880248
Signed-off-by: Robert Zieba <robertzieba@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68139
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
diff --git a/src/soc/amd/mendocino/Kconfig b/src/soc/amd/mendocino/Kconfig
index d31b29dd..9caee1e 100644
--- a/src/soc/amd/mendocino/Kconfig
+++ b/src/soc/amd/mendocino/Kconfig
@@ -75,6 +75,7 @@
 	select SOC_AMD_COMMON_BLOCK_PCI		# TODO: Check if this is still correct
 	select SOC_AMD_COMMON_BLOCK_PCI_MMCONF
 	select SOC_AMD_COMMON_BLOCK_PCIE_GPP_DRIVER	# TODO: Check if this is still correct
+	select SOC_AMD_COMMON_BLOCK_PCIE_CLK_REQ
 	select SOC_AMD_COMMON_BLOCK_PM		# TODO: Check if this is still correct
 	select SOC_AMD_COMMON_BLOCK_PM_CHIPSET_STATE_SAVE	# TODO: Check if this is still correct
 	select SOC_AMD_COMMON_BLOCK_PSP_GEN2	# TODO: Check if this is still correct