ARM: dts: qcom: msm8974: add blsp2_uart8

Add blsp2_uart8 node in order to support bluetooth on the
Samsung Galaxy S5 phone.

Signed-off-by: Alexey Minnekhanov <alexeymin@postmarketos.org>
Link: https://lore.kernel.org/r/20210406140551.3328241-1-alexeymin@postmarketos.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>