soc: qcom: pil: set device dma mask as 32 bit

APPS interact with MPSS through 32 bit register interface.
Set dma mask for 32 bit so that mba and mdt memory are allocated
from 32 bit physical address range.

Change-Id: I623f00097d464b1bdd8f609e2d6c9a126f4bea4d
Signed-off-by: Arun KS <arunks@codeaurora.org>