soc/amd: Add an option to select if SOC supports ESPI sub decode

Cezanne doesn't have eSPIx00034 register define in PPR. Currently only
Picasso need this option.

Change-Id: Icb8e8a1a59393849395125108bfaa884839ce10f
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48842
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/soc/amd/common/block/lpc/Kconfig

@@ -24,3 +24,8 @@ config SOC_AMD_COMMON_BLOCK_USE_ESPI
 	help
 	  Select this option if mainboard uses eSPI instead of LPC (if supported
 	  by platform).
+
+config SOC_AMD_COMMON_BLOCK_HAS_ESPI_SUB_DECODE
+	bool
+	depends on SOC_AMD_COMMON_BLOCK_HAS_ESPI
+	default n

src/soc/amd/common/block/lpc/espi_util.c

@@ -916,7 +916,8 @@ int espi_setup(void)
 	}
 
 	/* Enable subtractive decode if configured */
-	espi_setup_subtractive_decode(cfg);
+	if (CONFIG(SOC_AMD_COMMON_BLOCK_HAS_ESPI_SUB_DECODE))
+		espi_setup_subtractive_decode(cfg);
 
 	return 0;
 }

src/soc/amd/picasso/Kconfig

@@ -29,6 +29,7 @@ config CPU_SPECIFIC_OPTIONS
 	select SOC_AMD_COMMON
 	select SOC_AMD_COMMON_BLOCK_NONCAR
 	select SOC_AMD_COMMON_BLOCK_HAS_ESPI
+	select SOC_AMD_COMMON_BLOCK_HAS_ESPI_SUB_DECODE
 	select SOC_AMD_COMMON_BLOCK_IOMMU
 	select SOC_AMD_COMMON_BLOCK_ACPIMMIO
 	select SOC_AMD_COMMON_BLOCK_BANKED_GPIOS