msm: tspp: use an actual device structure for DMA allocation

Not supplying the device struct for arch arm64 causes some DMA
functions to issue runtime warning and fail.

Change-Id: Ic9a5d4d7de8debba16370a0b6a1e111861a17e7c
Signed-off-by: Gilad Broner <gbroner@codeaurora.org>