g: override RBOX fuses for correct POR behavior
g: override RBOX fuses for correct POR behavior

Sanity tested by powering up cr50 and checking for correct RBOX
register values.

This patch is mainly to address RBOX debounce issues and key blocking
while EC_RST is asserted.  A debounce value less than 4, sometimes
causes initial pin values to be incorrectly detected.  The latter is
related to https://chromium-review.googlesource.com/#/c/357590/.

As RBOX controls cannot be selectively bypassed (they have to be
bypassed as a group), all registers are set up in this patch

BUG=chrome-os-partner:54602
BRANCH=None
CQ-DEPEND=CL:377621
TEST=manual on Kevin

Do three-finger salute, enter recovery mode.

Change-Id: Ieb82c94fa33888ead359a77bf77981567998b3fc
Signed-off-by: Timothy Chen <d7b2ae30d8c0f215facd721941273067fd1d14a2@google.com>
Reviewed-on: https://chromium-review.googlesource.com/372001
Commit-Ready: Bill Richardson <129945214b1d548d8e49b6c29c43094f8c78057f@chromium.org>
Tested-by: Bill Richardson <129945214b1d548d8e49b6c29c43094f8c78057f@chromium.org>
Reviewed-by: Mary Ruthven <81380f3403fed74252e92df3ed012a1819ec6296@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec