Changes to kernel defconfig

Signed-off-by: Jeff Horn <jhorn@reachtech.com>
Add gpmi for NAND support to imx-bootlets

The imx-bootlets pass the kernel command line. This
add gpmi so the NAND driver is loaded

Signed-off-by: Jeff Horn <jhorn@reachtech.com>
Add UBI image generation for G2C

Signed-off-by: Jeff Horn <jhorn@reachtech.com>