Added return statements for bsa_drv_intf.c functions
Added return statements for bsa_drv_intf.c functions

- added return 0 for successful excecution.

Signed-off-by: Amrathesh <b9dbd1c2858d987e3a8ffa36357cc89b3ac5a75e@arm.com>

ARM-software/bsa-acs,ARM-software/bsa-acs