ion: msm: Remove [cma/dma]_get_[base/size] usage

Remove the usage of [cma/dma]_get_[base/size], as they
serve no functional purpose in the MSM ION driver at the
moment.

Change-Id: I1f2c25a0e53a5470be2b8cd8467acc0428cd215a
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>