msm: pil-msa: Add additional check while freeing DMA memory

The current check for freeing the 1MB of DDR memory allocated
for MBA is causing errors for femto-modem. Correct the check
to mitigate this.

Change-Id: I76074ee5843e74be82a38968398e8a4bd1e91ad3
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>