tcpm: it83xx: Output error message if enabling an unsupported configuration
tcpm: it83xx: Output error message if enabling an unsupported configuration

This patch will output an error message during compiling if we
try to enable an unsupported config option for it83xx PD driver.
This avoids the issue of an unknown EC reset caused by calling
function at address 0x00000000.

This change also remove empty definitions.

BUG=b:79700229,b:79706847,b:79637786
BRANCH=none
TEST=make buildall -j

Change-Id: I08accb88ae7c6d574dfcd115a5122acd2dfe46b4
Signed-off-by: Dino Li <338d523ecf3700bd86eb9c34d220f91911d2a18c@ite.com.tw>
Reviewed-on: https://chromium-review.googlesource.com/1059095
Reviewed-by: Jett Rink <9d4aef0593e6843318d99df31597fb6153b89787@chromium.org>

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