RT1715: Reset on EC reboot instead of POR
RT1715: Reset on EC reboot instead of POR

Currently we reset the RT1715 only when it is coming out of power-down
mode; however this requires explicitly putting it into power-down mode
or a full power cycle. An EC reboot will not power cycle the TCPC
though, and we really should be doing the reset following an EC reboot.

Do a soft_reset the 1st time we initialize the TCPC following an EC
reboot. Don't check the power-down bit.

BUG=b:179234089
TEST=Write to unused vendor registers such as 0x99; check that the
values are reset when "reboot" is used to reset the EC.
BRANCH=None

Signed-off-by: Eric Herrmann <12250e28c55eb76c3d4c0703db67acc60d621e70@chromium.org>
Change-Id: I0cc05ac88ec1314c20ceb357605156292b57b7c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2698779
Reviewed-by: Abe Levkoy <2e1ad7039298f93262cf06bbb457275fb3e2ecb5@chromium.org>

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