Add #include <string> for string  [build/include_what_you_use] [4]
Add #include <string> for string  [build/include_what_you_use] [4]

Signed-off-by: Michael Ira Krufky <00524723a60798c74a43fcc620c25dd7b9ece078@linuxtv.org>

mkrufky/node-dvbtee,mkrufky/node-dvbtee,mkrufky/node-dvbtee,mkrufky/node-dvbtee