[PATCH 2/3] arm64: dts: apq8016-sbc: add label properties for UART, I2C, and SPI

Rob Herring [off-list ref] writes:

Add label properties to provide a way to identify UART, I2C and SPI
ports based on their connector names. This follows naming convention in
96boards CE spec. Ports without external connections are not labelled.

Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Srinivas Kandagatla <redacted>
Cc: Andy Gross <redacted>

Acked-by: Kevin Hilman <redacted>
Tested-by: Kevin Hilman <redacted>

Tested this on my db410c (along with script from cover letter) and it
works great.

Kevin