Use globals naming scheme for kPageSize etc.

This patch is part of the chain preparing for making kPageSize
non-constexpr in a future patch.

The following values aren't always constexpr anymore - in some
configurations these are global dynamically initialized constants.

Rename them accordingly:
 - kPageSize to gPageSize;
 - kPMDSize to gPMDSize;
 - kPUDSize to gPUDSize;
 - kNumLrtSlots to gNumLrtSlots;
 - kStackOverflowProtectedSize to gStackOverflowProtectedSize.

Also fix the typo in the kMininumMapSize identifier.

Test: Same as for I5430741a8494b340ed7fd2d8692c41a59ad9c530.
      The whole patches chain was tested as a whole.
Change-Id: Ic8502aa66d75d2bbba698282a1eaf1a029b02d3a
61 files changed