Booting omap5 uevm results in the following error
"did not get pins for uart error: -19"

This happens because omap5 uevm dts file is not adapted
to use uart through pinctrl framework.
Populate uart pinctrl data to get rid of the error.
Signed-off-by: NSourav Poddar <sourav.poddar@ti.com>
[r.sricharan@ti.com: Replaced constants with preprocessor macros]
Signed-off-by: NSricharan R <r.sricharan@ti.com>
Signed-off-by: NBenoit Cousson <benoit.cousson@linaro.org>