mmc: host: Check for reset prior to DMA address unmap

Upon any command errors we should do a CMD and DAT reset
prior to DMA unmap but the current logic is other way.

So, with the existing change it could possible to access the
unmapped address before resetting and this leads to SMMU unmapped
address access faults. So, check for reset prior to DMA unmap.

Change-Id: I89a751118b00df1c952693a713cb5060739a0ed5
Suggested-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>
Signed-off-by: Pradeep P V K <pragalla@codeaurora.org>