soc/amd/genoa: Enable ECAM MMCONF support

Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Signed-off-by: Varshit Pandya <pandyavarshit@gmail.com>
Change-Id: I70db8bf9f553fa9bfd2a5c20a1393119786047f8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76504
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>

src/soc/amd/genoa/Kconfig

@@ -7,7 +7,6 @@ config SOC_SPECIFIC_OPTIONS
 	def_bool y
 	select ARCH_X86
 	select HAVE_EXP_X86_64_SUPPORT
-	select NO_ECAM_MMCONF_SUPPORT
 	select RESET_VECTOR_IN_RAM
 	select SOC_AMD_COMMON
 	select SOC_AMD_COMMON_BLOCK_ACPIMMIO
@@ -75,6 +74,14 @@ config ROMSTAGE_SIZE
 	help
 	  Sets the size of DRAM allocation for romstage in linker script.
 
+config ECAM_MMCONF_BASE_ADDRESS
+	hex
+	default 0xE0000000
+
+config ECAM_MMCONF_BUS_NUMBER
+	int
+	default 256
+
 menu "PSP Configuration Options"
 
 config AMDFW_CONFIG_FILE