ARM: dts: omap5-evm: Add keypad data

Add keypad data node in omap5 device tree file.
Also fill the device tree binding parameters
with the required value in "omap5-evm" dts file.

Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Felipe Balbi <balbi@ti.com>
[b-cousson@ti.com: Fix merge issue with MMC patches,
put node at the proper place, align entries and comments]
Signed-off-by: Benoit Cousson <b-cousson@ti.com>