ARM: dts: msm: Add new clock management flag for 8994

For msm8994 target, crypto module has only core source clock
which is different from older targets, so new flag is added
to differentiate from earlier targets.

Change-Id: I8ff8016fef5aaa3fdaae4fc69da7968bf748ea44
Signed-off-by: AnilKumar Chimata <anilc@codeaurora.org>