[U-Boot] [PATCH 0/10 v2] i.MX6: move duplicated options to mx6_common to standardise mx6 config

[Peter Robinson]

There's a lot of common options in the i.MX6 boards that are repeated across a 
lot of the devices. There's a mx6_common.h which is little used but makes sense
to be the central location for all the options we want across all mx6 boards to
ensure a consistent set of features. This is a first pass at moving those options
and unifying the common options to a standard default.

Changes since v1:
* Move CONFIG_SYS_NO_FLASH changes from patch 7 to patch 2 and reorder includes
so we don't need to undef CONFIG_CMD_FLASH / CONFIG_CMD_IMLS
* Add CONFIG_CMD_GPIO to mx6_common.f (patch 5)
* Use the default for all CONFIG_SYS_PROMPT_HUSH_PS2 (patch 7)
* Drop LZO change (patch 8) 

I think I got all the review points :)

Peter Robinson (10):
      novena: standardise mx6_common.h include
      imx6: move all standard includes to mx6_common.h
      imx6: move generic imx6 options to mx6_common.h
      imx6: move standard ATAG configs to mx6_common.h
      imx6: move MXC_GPIO define to mx6_common.h
      imx6: centralise common boot options in mx6_common.h
      imx6: move generic miscellaneous and overwrite options
      imx6: standardise filesystem and boot options
      imx6: generic MMC config options to mx6_common
      mx6: standardise CONFIG_CMD_CACHE

Reviewed-by: Eric Nelson <eric.nelson at boundarydevices.com>