ENGR00179013 : MX6Solo/Quad : SABREAUTO: Add Parallel NOR Support

-Added u-boot config CONFIG_CMD_WEIMNOR for MX6Solo/Quad SABREAUTO to
support WEIM NOR.
- CONFIG_FLASH_HEADER_OFFSET is 0x1000 for WEIM NOR.
-SPI NOR and WEIM NOR has pin conflicts, either one can be enabled.
- mx6q_sabreauto_config, mx6solo_sabreauto_config configured default
for SPI NOR.
-In order to enable  the read/write commands and to boot from WEIM NOR,
need to enable the CONFIG_CMD_WEIMNOR. This will disable SPI-NOR

Signed-off-by: Prabhu Sundararaj <b36876@freescale.com>