This patch adds a new config option to limit the maximum DRAM
frequency for Pantherlake platforms.
The mainboard code should try to set `max_dram_speed_mts` from
override device tree if required.
BUG=b:373394046
TEST=Able to build and boot google/fatcat.
Change-Id: Ic92947b2997c116ea8ed0abff4c6b3c2ca956c65
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85101
Reviewed-by: Amanda Hwang <amanda_hwang@compal.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <ericllai@google.com>
3f3ea8bb58