cr50: set SYS_RST_L as an input
cr50: set SYS_RST_L as an input

Setitng SYS_RST_L as an output contends with the EC setting it as an
output. We will only drive the pin when necessary.

BUG=none
BRANCH=none
TEST=power on kevin and make sure the AP is able to boot.

Change-Id: Ie40cc4932ff92d20b021765c3aa356d8902f20e1
Signed-off-by: Mary Ruthven <81380f3403fed74252e92df3ed012a1819ec6296@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/341326
Reviewed-by: Bill Richardson <129945214b1d548d8e49b6c29c43094f8c78057f@chromium.org>

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