ARM: dts: msm: Update TZ apps region and size for MSM8909

Change the TZ apps region and size for MSM8909 as per the memory map,
which update the base address and size of the region to 2MB.

Change-Id: I5fe403e125eea9382675f2478a02ae6143c2ee08
Signed-off-by: Brahmaji K <bkomma@codeaurora.org>