package/libcec: Bump to version 2.2.0

Kodi Helix depends on libcec >= 2.2.0

Removed libcec-0001-Fix-unregistering-a-callback-that-wasn-t-register.patch
applied upstream: https://github.com/Pulse-Eight/libcec/commit/485660f



Renamed remaining patch according to new naming convention.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>