util/intelp2m/platforms: Add support for Elkhart Lake

TEST:
- 'make test' = PASS;
- 'intelp2m -p ehl -file parser/testlog/inteltool_test.log' = no errors.

Change-Id: I0f60d182bc5cc3d0d1d1177fbda0cfe8e2279e46
Signed-off-by: Alexander Couzens <lynxis@fe80.eu>
Signed-off-by: Maxim Polyakov <max.senia.poliak@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84191
Reviewed-by: David Hendricks <david.hendricks@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

Documentation/util/intelp2m/index.md

@@ -73,6 +73,7 @@ The utility supports the following chipsets from Intel:
 * `apl` - Apollo Lake SoC
 * `cnl` - CannonLake-LP or Whiskeylake/Coffeelake/Cometlake-U SoC
 * `ebg` - Emmitsburg PCH with Xeon SP
+* `ehl` - Elkhart Lake SoC
 * `jsl` - Jasper Lake SoC
 * `lbg` - Lewisburg PCH with Xeon SP
 * `mtl` - MeteorLake SoC