PCI: epf-mhi: Fix the DMA data direction of dma_unmap_single()

PCI: epf-mhi: Fix the DMA data direction of dma_unmap_single()

In the error path of pci_epf_mhi_edma_write() function, the DMA data
direction passed (DMA_FROM_DEVICE) doesn't match the actual direction used
for the data transfer. Fix it by passing the correct one (DMA_TO_DEVICE).

Fixes: 7b99aaaddabb ("PCI: epf-mhi: Add eDMA support")
Reviewed-by: Krzysztof Wilczyński <kw@linux.com>
Link: https://lore.kernel.org/r/20231214063328.40657-1-manivannan.sadhasivam@linaro.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>