arm: Get rid of meminfo

memblock is now fully integrated into the kernel and is the prefered
method for tracking memory. Rather than reinvent the wheel with
meminfo, migrate to using memblock directly instead of meminfo as
an intermediate.

Change-Id: I9d04e636f43bf939e13b4934dc23da0c076811d2
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>