arm: mach-msm: tune thermal threashold

the default thermal parameters are a bit too low for desktop-like use cases, and
the CPU is very quickly max'd out at the minimal frequency. We increase slightly
the limit temperature, to delay the CPU throttling. Also we reduce the hysteris
setting to re-increase the cpu frequency quicker than before

Signed-off-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>