FROMLIST: arm64: dts: sdm845: Set the virtual address range for GMU allocations

GMU DMA allocations need to be mapped between 0x60000000 and 0x80000000 in
the GMU virtual address space. Specify the dma-range so the iova allocator
does the right thing.

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Link: https://lore.kernel.org/lkml/1582223216-23459-4-git-send-email-jcrouse@codeaurora.org/
Change-Id: I198b3ed8bad95ba38db00dd181604875b589b497