chell: Enable reset of EC on PD panic
chell: Enable reset of EC on PD panic

Enable the option to reset the EC when the PD panics.

BUG=chrome-os-partner:46289
BRANCH=none
TEST=verify that if PD is in RW and reboots then the EC
will panic and print "PD crash".

Change-Id: I69ab08914aef08b5ef0eaa447c142444113c526c
Signed-off-by: Duncan Laurie <70662b43bc1a20b57ded72a2b08be88dd0da4841@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/311308
Reviewed-by: Alec Berg <1a4429eeda29095a12e19a73405f80f5b7f37a63@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec,coreboot/chrome-ec