apex: Enable power driver

Change-Id: Ie5ba54b9c4051c67d49308bf30507c602c0fabf0
diff --git a/defconfig b/defconfig
index ae97bcc..5a943db 100644
--- a/defconfig
+++ b/defconfig
@@ -73,3 +73,4 @@
 CONFIG_USB_F_FS=y
 CONFIG_USB_F_ACM=y
 CONFIG_USB_GADGETFS=y
+CONFIG_GOOGLE_APEX_POWER=y