soc/intel/cannonlake: enable pch link in bootblock

soc/intel/cannonlake: enable pch link in bootblock

This moves the call to pch_enable_lpc() from romstage to bootblock.
In other words, it happens earlier in the boot process.  Turns out, we
need this to talk to the EC to determine if we're in recovery mode or
not.

BUG=b:69011806
TEST=boots to linux

Change-Id: I899bf343d705fe19a2978917bc88990495ebb5a3
Signed-off-by: Caveh Jalali <caveh@google.com>
Reviewed-on: https://review.coreboot.org/23401
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>