memory: renesas-rpc-if: Fix unbalanced pm_runtime_enable in rpcif_{enable,disable...

memory: renesas-rpc-if: Fix unbalanced pm_runtime_enable in rpcif_{enable,disable}_rpm

rpcif_enable_rpm calls pm_runtime_enable, so rpcif_disable_rpm needs to
call pm_runtime_disable and not pm_runtime_put_sync.

Fixes: ca7d8b980b67f ("memory: add Renesas RPC-IF driver")
Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Sergei Shtylyov <sergei.shtylyov@gmail.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20201126191146.8753-3-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>