ALSA: HDA: Increase MAX_HDMI_PINS

The recently introduced NVIDIA GeForce GT 520 has 4 pins within a single
codec. Bump MAX_HDMI_PINS to accomodate this. Also bump MAX_HDMI_CVTS
to match it; this might be needed later too.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>