ARM: dts: msm: Enable emergency frequency mitigation for apq8084

Enable emergency frequency mitigation for CPU0, which
throttles the CPU frequency when a preset threshold
is reached.

CRs-Fixed: 549942
Change-Id: I949748c52338bc88f81603c638521f6260f5bf51
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>