msm: memory: use memblock instead of meminfo

msm currently uses meminfo (not memblock) in memory.c for several
purposes (mainly the placement of the memory pool(s)).  When the code
was written originally, memblock didn't exist yet.

Now that memblock exists, this is not strictly correct, but works as
long as nobody calls memblock_remove() besides this code (if that
occurs then the meminfo data no longer reflect reality and will likely
cause overlap problems).

To avoid problems meminfo usage should be replaced with memblock.

Also, since memblock regions of the same type can't be contiguous, the
total_size function, which calculated the aggregate size of contiguous
meminfo banks, can be removed.

Change-Id: I34054c4fe367986f472bdaae65be67cd8fbf273a
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>