MMC_IOC_CMD and MMC_IOC_MULTI_CMD ioctl() code currently bails on
any eMMC errors. However, in case there is any resp[] data, we
should attempt to copy resp[] back to user space. The user app
can then determine which command(s) failed in the MMC_IOC_MULTI_CMD
case AND/OR report better diagnostics in both cases.

Gwendal Grignou provided the idea and it was previously implemented
and tested on v3.18 ChromeOS kernel:
    https://chromium-review.googlesource.com/#/c/299956Signed-off-by: NGrant Grundler <grundler@chromium.org>
Reviewed-by: NHyung Taek Ryoo <hryoo@nvidia.com>
Reviewed-by: NGwendal Grignou <gwendal@chromium.org>
Tested-by: NDavid Riley <davidriley@chromium.org>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>