Revert "RDS: fix the sg allocation based on actual message size"

Revert "RDS: fix the sg allocation based on actual message size"

This reverts commit 23f90cccfba4 ("RDS: fix the sg allocation based on
actual message size") because RDS has implemented N sge to support large
fragment size, with each sge of PAGE_SIZE.

Orabug: 26770234

Signed-off-by: Wei Lin Guay <wei.lin.guay@oracle.com>
Reviewed-by: Håkon Bugge <haakon.bugge@oracle.com>
Tested-by: Shih-Yu Huang <shih-yu.huang@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: Dhaval Giani <dhaval.giani@oracle.com>