Revert "ARM: dma-mapping: remove dmac_clean_range and dmac_inv_range"

This partially reverts 'commit 702b94bf ("ARM: dma-mapping:
remove dmac_clean_range and dmac_inv_range")'

Some MSM drivers still use the dmac_clean and dmac_inv_range APIs.
Bring back the defines and exports for v7 CPUs.

Change-Id: I69017d73da1065a5eeb9c87c899b6a51be5ebfe6
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>
Signed-off-by: Abhimanyu Kapur <abhimany@codeaurora.org>
[sramana: resolved minor merge conflicts]
Signed-off-by: Srinivas Ramana <sramana@codeaurora.org>
[akdwived: Made change for checkpatch error]
Signed-off-by: Avaneesh Kumar Dwivedi <akdwived@codeaurora.org>