RFC: Remove CONFIG_OF_HAS_UBOOT_ENV and CONFIG_OF_HAS_BD_T

Hi Dan,

There are two configuration switches which are used only by the stxxtc board, of which you are listed as the maintainer.
CONFIG_OF_HAS_UBOOT_ENV
CONFIG_OF_HAS_BD_T
These add the u-boot env variables and the bd_t struct into the fdt blob before booting linux.

The value of doing this was debated a while back and the consensus was that it is Not A Good Thing[tm].
<http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/33643/focus=33653>

I don't believe either is actually used in linux. I didn't find "u-boot-env" at all and the "bd_t" matches did not look like FDT stuff (struct bd_t stuff).

Per the discussion on the u-boot list, these config switches were declared deprecated. I propose to remove them at this time.

Best regards,
gvb