ARM: dts: msm: Modify qdss region for sdm670/sdm845

FW supports only pages in units of 1MB hence making qdss
region size to be 1MB.

Change-Id: I5f616cbc84d055cc00809f75fd5a02bfe328c480
Signed-off-by: Karthik Anantha Ram <kartanan@codeaurora.org>