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This change is preparing for an upcoming refactor. kFreePagesNumBits
and kGpaMaxPages are equivalent. Get rid of the latter with a
static_assert() that kGpaMaxPages is always equal to the size of the
BitMap.

Bug: 896019
Change-Id: I7e99766d2e6fffa0e3d3eb3a47a2e76038b522ab
Reviewed-on: https://chromium-review.googlesource.com/c/1340526Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608936}