RDS: IB: use max_mr from HCA caps than max_fmr
RDS: IB: use max_mr from HCA caps than max_fmr

All HCA drivers seems to popullate max_mr caps and few of
them do both max_mr and max_fmr.

Hence update RDS code to make use of max_mr.

Signed-off-by: Santosh Shilimkar <66e607276a8849b0959ff0d01d8643f5da668152@kernel.org>
Signed-off-by: Santosh Shilimkar <5b4d8dc9ea337fff5fd1729321eda9873ade0b09@oracle.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs