ARM: dts: msm: Decrease qseecomm region size for msm8909w

Modify device tree entry for qseecom to decrease allocated
space to 1MB.

Change-Id: I06eea658f783f56ed29cf95fb3936f06e3e73fef
Signed-off-by: Neeraj Soni <neersoni@codeaurora.org>