ARM: I2C: I2C Multi byte address support

Existing OMAP I2C driver does not support address
length greater than one. Hence this patch is to
add support for 2 byte address read/write.

Signed-off-by: Philip, Avinash <avinashphilip@ti.com>
Signed-off-by: Hebbar, Gururaja <gururaja.hebbar@ti.com>
Signed-off-by: Patil, Rachna <rachna@ti.com>