memory: renesas-rpc-if: Silence clang warning

This patch silences the following clang warning:

| drivers/memory/renesas-rpc-if.c:253:14: warning: cast to smaller integer
| type 'enum rpcif_type' from 'const void *' [-Wvoid-pointer-to-enum-cast]
|           rpc->type = (enum rpcif_type)of_device_get_match_data(dev);
|                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Fixes: b04cc0d9 ("memory: renesas-rpc-if: Add support for RZ/G2L")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20211121180155.9062-1-prabhakar.mahadev-lad.rj@bp.renesas.com


[krzysztof: drop enum rpcif_type cast]
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>