Platforms/ARM: enable memory protection featuresarmlt-20170317-001

This enables the recently added and/or enhanced memory protection
features in upstream EDK2:
- strict code/data separation PE/COFF sections so that mappings can
  be made either read-only or non-executable
- remove exec permissions from all other (i.e., non-code) regions (as
  far as is feasible without breaking GRUB)
- remap the DXE stack as non-executable before entering DxeCore

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Ryan Harkin <ryan.harkin@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

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