ARM: dts: msm: Add max secure concurrent instance count for msm8996

Limit max secure concurrent instances to 5 due to some
system wide limitations like memory, performance etc. This
is only appcible for master side access control.

Change-Id: I3963d7f747389ea0f5b8814cdb3d8436ba465e9e
Signed-off-by: Shalaj Jain <shalajj@codeaurora.org>