ARM: dts: msm: Increase polling delay for ADC thermistors on MSM8905

Increase polling delay for case therm adc thermistors to ensure they
are read periodically to implement thermal mitigations.

Change-Id: Ia36dda8652ccfa338359929e4a3d26c496396e27
Signed-off-by: Asha Magadi Venkateshamurthy <amagad@codeaurora.org>