ARM: dts: msm8994: Change qseecom TZ apps memory size to 5MB

Based on 8994 memmap, TZ secure app memory size should be 5M, but
it is set 3M currently, which causes multiple TZ app loading failure.
Thus, change qseecom TZ secure apps memory size to 5MB.

CRs-Fixed: 738399
Change-Id: I29c1be140e4b538a1c3d4ec0c9998848e327594c
Signed-off-by: Zhen Kong <zkong@codeaurora.org>