zephyr: Add CONFIG_EXTPOWER_GPIO to the shim
This is not strictly necessary, but shows up as a delta from the
existing volteer config. So let's define it.
BRANCH=none
TEST=build zephyr and see that extpower_gpio.c is still built
@@ -143,6 +143,8 @@ enum battery_type {
#endif
#ifdef CONFIG_PLATFORM_EC_EXTPOWER_GPIO
+#define CONFIG_EXTPOWER_GPIO
+
/* This always needs to be defined for this option to work */
#define CONFIG_EXTPOWER
#endif
