zoombini: Temporarily use GPIOs for SLP signals.
This commit can be reverted when Si arrives.
BRANCH=None
TEST=Flash zoombini;  EC comes up okay.
Commit-Ready: Aseda Aboagye
Tested-by: Aseda Aboagye
/* EC Modules */
#define CONFIG_ADC
#define CONFIG_ESPI
-#define CONFIG_ESPI_VW_SIGNALS
+/* TODO(aaboagye): Uncomment when Si arrives. */
+/* #define CONFIG_ESPI_VW_SIGNALS */
#define CONFIG_I2C
#define CONFIG_LPC
#define CONFIG_PWM
