package/mmc-utils: bump to version dfc3b6ecda84d21418fb4408b39c5c71db4c6458

Drop first patch, upstreamed:
https://git.kernel.org/pub/scm/utils/mmc/mmc-utils.git/commit/?id=520f54eb94845e597837ae908a03b91ae8c8758f

Depends on kernel headers >= 4.4 for struct mmc_ioc_multi_cmd

Fixes: http://autobuild.buildroot.net/results/01f78081a50743d1faa50a090c00b7e90a17fa39



Signed-off-by: Sébastien Szymanski <sebastien.szymanski@armadeus.com>
Reviewed-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>