ARM: OMAP: Add mux for GPIO pins 134, 54 and 136

On OMAP3EVM Mass Market Daugher Card following GPIO pins are being
used -

GPIO134 --> Enable/Disable TVP5146 interface
GPIO54 --> Enable/Disable Expansion Camera interface
GPIO136 --> Enable/Disable Camera (Sensor) interface

Added entry for the above GPIO's in mux.c and mux.h file

Signed-off-by: Brijesh Jadav <brijesh.j@ti.com>
Signed-off-by: Hardik Shah <hardik.shah@ti.com>
Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>