sw: Make i2c-ocores driver compatible with Linux Kernel Version > 4.7.0
This is done by aligning definations of i2c_add_mux_adapters and i2c_del_mux_adapters with updated i2c-mux.h in later kernel version.
Signed-off-by: Mamta Shukla mamta.ramendra.shukla@cern.ch