i.MX31: Restructure UART setup for PDK board.
i.MX31: Restructure UART setup for PDK board.

Restructure UART pin setup in preparation for adding other pins
in later patches.

Signed-off-by: Magnus Lilja <15ec06a083d896b928853d9901e4917e2172fa06@gmail.com>
Signed-off-by: Sascha Hauer <c00cbc2b736c26791a3822db86f8796fe9efff67@pengutronix.de>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs