ARM: tegra: pluto: memory: add table for 2GB memory

ARM: tegra: pluto: memory: add table for 2GB memory

- Use API memblock_phys_mem_size() to get memory size
- Based on memory size, select tables at runtime
  for 1GB or 2GB memory for board AP40

Bug 1327872

Change-Id: I89d5ac405e0c4b96d1dedca0740ad429a7551ff6
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/252421
(cherry picked from commit b98e0795b726ca4c148e1089d64574aa5586e053)
Reviewed-on: http://git-master/r/253254
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Sachin Nikam <snikam@nvidia.com>