mmc: sunplus: Fix error handling in spmmc_drv_probe()

When mmc allocation succeeds, the error paths are not freeing mmc.

Fix the above issue by changing mmc_alloc_host() to devm_mmc_alloc_host()
to simplify the error handling. Remove label 'probe_free_host' as devm_*
api takes care of freeing, also remove mmc_free_host() from remove
function as devm_* takes care of freeing.

Fixes: 4e268fed

 ("mmc: Add mmc driver for Sunplus SP7021")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/all/a3829ed3-d827-4b9d-827e-9cc24a3ec3bc@moroto.mountain/
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230809071812.547229-1-harshit.m.mogalapalli@oracle.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>