Enable CONFIG_DEVTMPFS_MOUNT to ensure /dev can be mounted correctly

[Scott Wood]

On Thu, Apr 11, 2013 at 09:56:30PM +0800, Zhenhua Luo wrote:
> When using recent udev, the /dev node mount requires CONFIG_DEVTMPFS_MOUNT
> is enabled in Kernel. The patch enables the option in defconfig of Freescale
> QorIQ targets.
> 
> Changed defconfig list:
>    arch/powerpc/configs/85xx/p1023rds_defconfig
>    arch/powerpc/configs/corenet32_smp_defconfig
>    arch/powerpc/configs/corenet64_smp_defconfig
>    arch/powerpc/configs/mpc85xx_smp_defconfig

What about mpc83xx and mpc85xx (non-smp)?

It'd be nice if non-hardware-specific things that are required for a
typical Linux system were "default y".  Even nicer if we could have
config fragments for various usage profiles that are separate from
hardware config.

-Scott