arm: dts: drop qcom dts files

These files are all identical (or older) than those in dts/upstream.
Drop them as we now use upstream DTS files with OF_UPSTREAM.

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>