ARM: omap2plus_defconfig: Enable INPUT_MOUSEDEV as loadable modules

Otherwise mice won't be happy.
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/configs/omap2plus_defconfig

@@ -188,6 +188,7 @@ CONFIG_WL12XX=m
 CONFIG_WL18XX=m
 CONFIG_WLCORE_SPI=m
 CONFIG_WLCORE_SDIO=m
+CONFIG_INPUT_MOUSEDEV=m
 CONFIG_INPUT_JOYDEV=m
 CONFIG_INPUT_EVDEV=m
 CONFIG_KEYBOARD_ATKBD=m