i2o: core: removed a redundant flag.

I2O_TYPE_SHIFT_MINIMAL was a redundant flag which should've already been
removed in the previous patch. The flag used to define how much the type
field in `struct i2o_channel' should be shift to the right (as a
minimum, due to core flags). The deletion of the shift field in the
previous patch made this definition redundant.

Signed-off-by: Michel Megens <dev@michelmegens.net>