soc/intel/elkhartlake: Switch to runtime generation of Power Engine

The pep.asl file is being obsoleted by runtime generation, therefore
switch elkhartlake boards to this method.

Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Change-Id: I47f03b440729d4b37ae0abc84bd1d18c4e01657d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56012
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
diff --git a/src/soc/intel/elkhartlake/Kconfig b/src/soc/intel/elkhartlake/Kconfig
index beea595..3471bb1 100644
--- a/src/soc/intel/elkhartlake/Kconfig
+++ b/src/soc/intel/elkhartlake/Kconfig
@@ -40,6 +40,7 @@
 	select SOC_INTEL_COMMON_BLOCK_ACPI
 	select SOC_INTEL_COMMON_BLOCK_ACPI_GPIO
 	select SOC_INTEL_COMMON_BLOCK_ACPI_LPIT
+	select SOC_INTEL_COMMON_BLOCK_ACPI_PEP
 	select SOC_INTEL_COMMON_BLOCK_CAR
 	select SOC_INTEL_COMMON_BLOCK_CHIP_CONFIG
 	select SOC_INTEL_COMMON_BLOCK_CPU