We already have some documentation describing how to enable debug UART
for Qualcomm SoCs. However the UART address varies per-soc... Add some
config fragments to enable debug UART for few well supported SoCs.
These can be used like:
$ make qcom_defconfig debug-sdm845.config
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
