spi: rpc-if: Fix RPM imbalance in probe error path

If rpcif_hw_init() fails, Runtime PM is left enabled.

Fixes: b04cc0d9 ("memory: renesas-rpc-if: Add support for RZ/G2L")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/1c78a1f447d019bb66b6e7787f520ae78821e2ae.1648562287.git.geert+renesas@glider.be


Signed-off-by: Mark Brown <broonie@kernel.org>