mmc: sdhci-of-k1: Fix error code in probe()

If spacemit_sdhci_get_clocks() fails, then propagate the error code.
Don't return success.

Fixes: e5502d15 ("mmc: sdhci-of-k1: add support for SpacemiT K1 SoC")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Yixun Lan <dlan@gentoo.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/aDVTtQdXVtRhxOrb@stanley.mountain


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>