soc/intel/meteorlake: Add configs for pre-production silicon

Certain Intel Meteor Lake specific features are only enabled in
production silicon (not available in early SoC aka pre-production
silicon).
- SPI usage for production SoC is much optimized compared to pre-
production silicon.
- MIPI driver requires a way to identify between pre-prod vs prod
silicon.

This patch adds config options to select the Pre-Production
aka Engineering Silicon (ES). The mainboard users can specify which
underlying SoC is being used for the target platform.

BUG=b:300652989
TEST=No change in the functionality, just added new configs.

Change-Id: I60fe11c1151a3a6c290cd0105eb570cb78e81797
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77991
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-by: Jakub Czapiga <jacz@semihalf.com>
Reviewed-by: Jamie Ryu <jamie.m.ryu@intel.com>

src/soc/intel/meteorlake/Kconfig

@@ -121,6 +121,14 @@ config SOC_INTEL_METEORLAKE_S
 	  Choose this option if your mainboard has a MTL-S (35W or 65W) SoC.
 	  Note, MTL-S SoC combines Compute, GFX, SoC, IOE and PCH die.
 
+config SOC_INTEL_METEORLAKE_PRE_PRODUCTION_SILICON
+	bool
+	default n
+	help
+	  Choose this option if your mainboard has a Meteor Lake pre-production
+	  silicon. Typically known as engineering samples (like ES). This type
+	  of the silicon are very common for early platform development.
+
 if SOC_INTEL_METEORLAKE
 
 config SOC_INTEL_METEORLAKE_TCSS_USB4_SUPPORT