ARM: dts: msm: Update KTM emergency mitigation thresholds for MSM8939

Lower KTM emergency hotplug threshold, emergency frequency
mitigation threshold and frequency limit for MSM8939.

Change-Id: I02a638f5bbe7478a7d2a800dc0763881bb542e44
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>