msm: dma: Add graceful argument to msm_dmov_flush

The graceful argument allows clients to specify whether they want
to flush now, or wait until the end of the current scatter gather or
box mode descriptor. This also helps us unify msm_dmov_flush and
msm_dmov_stop_cmd.

Change-Id: Ifdfe5da804e79343782cc2999ad3624d2afbec4d
Signed-off-by: Jeff Ohlstein <johlstei@codeaurora.org>
5 files changed