arm64: dts: qcom: msm8916-acer-a1-724: Add touchscreen

A1-724 uses a Focaltech FT5446 touchscreen that is connected to blsp_i2c5.
Add it to the device tree.

Signed-off-by: Lin, Meng-Bo <linmengbo0689@protonmail.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221123033844.149115-1-linmengbo0689@protonmail.com