`checkpatch.pl` requires that dts sources are indented with tabs,
fix all the spaces that slipped in while checkpatch wasn't watching.
Signed-off-by: Jordan Yates <jordan@embeint.com>
Move from using Kconfig TRACING_BACKEND_UART_NAME to a devicetree
chosen property ("zephyr,tracing-uart"). This is similar to a number
of other functions like "zephyr,shell-uart" or "zephyr,bt-uart".
Signed-off-by: Kumar Gala <galak@kernel.org>