drivers: renesas: rcar: eMMC driver code clean up

Fix checkpatch warnings and MISRA defects.

There are no functional changes.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Change-Id: I349a8eaa7bd6182746ba5104ee9fe48a709c24fd
10 files changed