x86: Change testing logic of mtrr commit

On Coral U-Boot SPL programs some MTRRs and FSPv2 in U-Boot proper
needs to program MTRRs too. With current testing logic of mtrr
commit in init_cache_f_r(), the mtrr commit is skipped which won't
work as the queued mtrr requests include setup for DRAM regions.

Change the logic to allow such configuration.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Tweak to put back CONFIG_FSP_VERSION2 at top:
Signed-off-by: Simon Glass <sjg@chromium.org>