msm: ADSPRPC: Remove duplicate map size check during map create

Current mmap create does a map size check in one of the case
to avoid SMMU faults. There is a duplicate check for the same
and logs are not getting printed properly if map size is not
proper.

Change-Id: I8acd321b7204968b5edd9457dba07eddd893e1bf
Acked-by: Ekansh Gupta <ekangupt@qti.qualcomm.com>
Signed-off-by: Jeya R <jeyr@codeaurora.org>