arm64: dts: qcom: msm8994: Add I2C, SPI and BLSP DMA nodes

Add support for I2C and SPI buses to enable peripherals
such as touchscreens or sensors. Also add DMA nodes,
configuration and BLSP2 UART2 interface.

Signed-off-by: Konrad Dybcio <konradybcio@gmail.com>
Link: https://lore.kernel.org/r/20200623224813.297077-8-konradybcio@gmail.com
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>