Fix some warnings seen when generating configs.

- CONFIG_SUSPEND_TIME was for an Android driver that has been dropped.
- CONFIG_TABLET_USB_WACOM was removed in 3.16.
  (HID_USB_WACOM replaced it, and is being set correctly.)
- CONFIG_PM_RUNTIME was removed in 3.19.

Bug: none
Change-Id: Id37ff79248f3a0ef9a060700c4a3613c8bb3a6e2
Signed-off-by: Alistair Strachan <astrachan@google.com>