treewide: strip trailing whitespace where present

treewide: strip trailing whitespace where present

Ran a treewide trailing-whitespace cleanup for *.c, *.h, *.dts and *.dtsi.
Only files under target/linux/lantiq/... and target/linux/qualcommax/...
required changes, so the diff is limited to those paths.

Done by executing commands:
find . -type f | grep "\.c$" | xargs sed -i 's/[ \t]\+$//'
find . -type f | grep "\.h$" | xargs sed -i 's/[ \t]\+$//'
find . -type f | grep "\.dts$" | xargs sed -i 's/[ \t]\+$//'
find . -type f | grep "\.dtsi$" | xargs sed -i 's/[ \t]\+$//'

Signed-off-by: Mieczyslaw Nalewaj <namiltd@yahoo.com>
Link: https://github.com/openwrt/openwrt/pull/24255
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>