arm64: dts: msm8998: thermal: Fix number of supported sensors

msm8998 has 22 sensors connected in total, 14 on the 1st controller, 8
on the 2nd controller. Increase the number to allow sensors with ID 12
and 13 to be registered.

Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
Tested-by: Marc Gonzalez <marc.w.gonzalez@free.fr>
Signed-off-by: Andy Gross <agross@kernel.org>