projects/imx6/patches/libcec: remove project based libcec patches

Signed-off-by: Stephan Raue <stephan@openelec.tv>
projects/imx6/patches/linux: update project based CEC driver patches

Signed-off-by: Stephan Raue <stephan@openelec.tv>
libcec: update to libcec-2.2.0 for all plattforms, add updated patch to add support for iMX6 systems

Signed-off-by: Stephan Raue <stephan@openelec.tv>