CL provides some useful information similar to the EC console command
'pd state <port>' when host command 'usbpd <port>' is sent from host
with no additional arguments.
Also added a few build asserts for role & mux strings.
BRANCH=none
BUG=chrome-os-partner:31690
TEST=manual
ectool --interface=lpc --dev=1 usbpd 1
Port C1 is enabled. Role:SNK Polarity:CC1 State:6
# has zinger attached
ectool --interface=lpc --dev=1 usbpd 0
Port C0 is enabled. Role:SNK Polarity:CC1 State:2
Change-Id: Id44eb7bf6a6fcfa888a0008a2249601967c50bcc
Signed-off-by: Todd Broch <tbroch@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/217138
Reviewed-by: Alec Berg <alecaberg@chromium.org>