mb/starlabs/starbook/rpl: Disconnect unused GPIO

This GPIO isn't connected to anything so remove the config.

Change-Id: I8792a28877dc180eeb44386fefff15b3f75f4699
Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84731
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>

src/mainboard/starlabs/starbook/variants/rpl/gpio.c

@@ -242,7 +242,7 @@ const struct pad_config gpio_table[] = {
 	/* E1:		Not used		Accelerometer Interrupt	*/
 	PAD_NC(GPP_E1, NONE),
 	/* E2:		Not Connected					*/
-	PAD_CFG_GPO(GPP_E2, 1, PLTRST),
+	PAD_NC(GPP_E2, NONE),
 	/* E3:		WiFi RF Kill					*/
 	PAD_NC(GPP_E3, NONE),
 	/* E4:		Retimer Force Power				*/