msm: Enable fmem support on 7x27a

fmem makes better use of memory by allowing the system
to use pmem memory for other purposes when pmem is not
using it.

Make the pmem adsp region use fmem instead of the standard
carveout memory. When all the pmem is freed up, the pages will
be available for use by the system. The pages will be available
for pmem again when necessary.

Change-Id: Iefd2b17468fc21bf562bad5d53ca257a65d5e6a2
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>