thermal/drivers/tsens: fix slope values for msm8939

According to the vendor kernels (msm-3.10, 3.14 and 3.18), msm8939
uses non-standard slope values for calibrating the sensors. Fill them
accordingly.

Fixes: 332bc8eb ("thermal: qcom: tsens-v0_1: Add support for MSM8939")
Cc: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Cc: Shawn Guo <shawn.guo@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>