i2c: expose port num during unwedge console output.
i2c: expose port num during unwedge console output.

Signed-off-by: Todd Broch <035f5b1f817cbb94019cec357b99778115602b63@chromium.org>

BUG=b:72837836
TEST=manual,
on Nami, 'echo mem > /sys/power/state'

From EC console see,
[4823.162371 I2C4 unwedge failed, SCL is held low

Change-Id: Ic66c7fe00442fdcef90b3a0e4c10bcddc73e04c6
Reviewed-on: https://chromium-review.googlesource.com/981450
Commit-Ready: Todd Broch <035f5b1f817cbb94019cec357b99778115602b63@chromium.org>
Tested-by: Todd Broch <035f5b1f817cbb94019cec357b99778115602b63@chromium.org>
Reviewed-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>
Reviewed-by: Todd Broch <035f5b1f817cbb94019cec357b99778115602b63@chromium.org>

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