-Wimplicit-fallthrough is being enabled by default. Some compilers
such as clang require the attribute instead of just a fallthrough comment.
modify the DMA direction parameter from
PCI_DMA_FROMDEVICE to DMA_FROM_DEVICE.
Added missing break statement.
Change-Id: I1a226b1c2ce92c7290a094b33a81968d27ff74b3
CRs-Fixed: 3505237