mmc: fsl_esdhc_spl: Fix checking for number of read sectors

Commit 0980cbba ("mmc: fsl_esdhc_spl: pre-PBL: implement redundancy
support") changed number of sectors which are read but did not adjusted
error check.

Fix it and check for if correct number of sectors were read.

Fixes: 0980cbba ("mmc: fsl_esdhc_spl: pre-PBL: implement redundancy support")
Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>