Move the cx88 specific initialization for Hauppauge XVR remotes
into cx88-input, removing the need for test it inside ir-kbd-i2c.

The reference at cx88 for this symbol, at:

drivers/media/video/cx88/cx88-i2c.c:    core->i2c_adap.id = I2C_HW_B_CX2388x;
drivers/media/video/cx88/cx88-vp3054-i2c.c:     vp3054_i2c->adap.id = I2C_HW_B_CX2388x;

Can't be removed yet, since lirc-i2c still uses it.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>