Remove the indirection through _dma_cache_sync.  Also move the functions
up a bit in the source file as we'll need them in more places soon.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Tested-by: NAlexey Brodkin <abrodkin@synopsys.com>
Acked-by: NVineet Gupta <vgupta@synopsys.com>