Fixes for omaps for v4.3-rc cycle:

- Fix oops with LPAE and moew than 2GB of memory by enabling
  ZONE_DMA for LPAE. Probably no need for stable on this one as we
  only recently ran into this with the mainline kernel

- Fix imprecise external abort caused by bogus SRAM init. This affects
  dm814x recently merged, so no need for stable on this one AFAIK
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