Add function to force memory training and add VPD variable to operate
this function.
Tested=On OCP Delta Lake, memory training can be forced via VPD.
Signed-off-by: Tim Chu <Tim.Chu@quantatw.com>
Change-Id: I53a923b51b36f9f5db491ef142109f58f9a4611d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51972
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Zhang <jonzhang@fb.com>
96088bf089