MAINTAINERS: Add entry for Qualcomm TSENS thermal drivers

Create an entry for the TSENS drivers and mark them as maintained

Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Acked-by: Rajendra Nayak <rnayak@codeaurora.org>
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>