ARM: omap3_logic: Add NOR Flash Support for SOM-LV

The DM37 and OMAP35 SOM-LV SOM-LV products both support a NOR
flash part connected to CS2 in addition to the NAND part on CS0.
This patch setups the GPMC timings for the MT28 NOR Flash and
enables the CFI-Flash driver now that the CFI stuff is in Kconfig

Signed-off-by: Adam Ford <aford173@gmail.com>