ASoC: msm: qdsp6v2: delete ocmem drivers

ocmem drivers are deprecated, no plan to use in future.

Change-Id: Ie61f0b0bd404b8fdeee44d7839f6509e70776a9c
Signed-off-by: Fred Oh <fred@codeaurora.org>
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>