Revert "[MMC] Patch the firmware of certain Samsung emmc parts to fix a bug"

This reverts commit 446b2f43481bb79fdad90ee8c25b68558b451b75.
Revert "mmc: core: new discard feature support at Samsung eMMC v4.41+. (partial)"

This reverts commit 500c171d3c5d26479a8a5841d471996cd6ad5b30.