util/intelp2m: Add Intel Pad to Macro utility

This patch adds a new utility for converting a pad configuration from
the inteltool dump to the PAD_CFG_*() macros [1] for coreboot and GPIO
config data structures for FSP/sdk2-platforms/slimbootloader [2,3].
Mirror: https://github.com/maxpoliak/pch-pads-parser.git

[1] src/soc/intel/common/block/include/intelblocks/gpio_defs.h
[2] https://slimbootloader.github.io/tools/index.html#gpio-tool
[3] 3rdparty/fsp/CometLakeFspBinPkg/CometLake1/Include/GpioSampleDef.h

Change-Id: If3e3b523c4f63dc2f91e9ccd16934e3a1b6e21fa
Signed-off-by: Maxim Polyakov <max.senia.poliak@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35643
Reviewed-by: Andrey Petrov <andrey.petrov@gmail.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

util/intelp2m/fields/fields.go

@@ -0,0 +1,20 @@
+package fields
+
+import "../config"
+import "../platforms/common"
+
+import "./fsp"
+import "./cb"
+import "./raw"
+
+// InterfaceSet - set the interface for decoding configuration
+// registers DW0 and DW1.
+func InterfaceGet() common.Fields {
+	var fldstylemap = map[uint8]common.Fields{
+		config.NoFlds  : cb.FieldMacros{}, // analyze fields using cb macros
+		config.CbFlds  : cb.FieldMacros{},
+		config.FspFlds : fsp.FieldMacros{},
+		config.RawFlds : raw.FieldMacros{},
+	}
+	return fldstylemap[config.FldStyleGet()]
+}