reef: don't reset analogix pd chip out of band of driver
reef: don't reset analogix pd chip out of band of driver

board_reset_pd_mcu() was provided to ensure a microcontroller USB PD
implmenetation was reset. However, performing this sequence without
coordinating with the analogix driver results in a mismatch of
expectations regarding the internal polarity. The driver already
sets the expected interrupt polarity, but performing this reset
in chipset_pre_init() changes the expected setting which results
in occasional power sequence state machine hangs since
tcpc_get_alert_status() was always returning true. Lastly, added
comment to board_reset_pd_mcu() indicating how that sequence is likely
not needed if it's only invoked in the EC reset path.

Getting the analogix chip out of reset works in conjunction with the
default gpio settings for USB_PD_RST_ODL as well as the implementation
of board_set_tcpc_power_mode().

BUG=chrome-os-partner:53035
BRANCH=None
TEST=Rachel tested with change. Consistent power sequencing completes
     without any hangs.

Change-Id: I9ffabaf85f33d6a361caef631e3e6d86c4cf8081
Signed-off-by: Aaron Durbin <af0622ab041e8b0f8e5819838dcc93898196e71f@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/346733
Reviewed-by: Shawn N <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>

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