ARM: SoC cleanups for v4.9

The cleanups for v4.9 are a little larger that usual, but thankfully
that is almost exclusively due to removing a significant number of
files that have become obsolete after the still ongoing conversion
of old board files to devicetree.

- for mach-omap2, which is still the largest platform in arch/arm/,
  the conversion to DT is finally complete after the Nokia N900 is
  now fully supported there, along with the omap3 LDP, and we can
  remove those two board files.
  If no regressions are found, another large cleanup for the platform
  will happen as a follow-up, removing dead code and restructuring
  the platform based on being DT-only.

- In mach-imx, similar work is ongoing, but has not come that far.
  This time, we remove the obsolete board file for the i.MX1
  generation, which like i.MX25, i.MX5, i.MX6, and i.MX7 is now DT-only.
  The remaining board files are for i.MX2 and i.MX3 machines
  based on old ARM926 or ARM1136 cores that should work with DT
  in principle.

- realview has just been converted from board files to DT, and a lot
  of code gets removed in the process. This is the last
  ARM/Keil/Versatile derived platform that was still using board
  files, the other ones being integrator, versatile and vexpress.
  We can probably merge the remaining code into a single directory
  in the near future.

- clps711x had completed the conversion in v4.8, but we accidentally
  left the files in place that should have been deleted then.

Conflicts: two files deleted here have been modified upstream,
the changes can be discarded.
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