tegra: hdmi: audio: sysfs node for max audio channel info

tegra: hdmi: audio: sysfs node for max audio channel info

Provide max_pcm_channels from the EDID audio info
to HAL before the EDID audio info gets copied to
the HDA codec driver. This is done since HAL requires
prior channel information in order to open the pcm
device

Bug 200009194

Change-Id: I2dd365a095705950901ec2228b94c8a3a63b1abd
Signed-off-by: Anshuman Nath Kar <anshumank@nvidia.com>
(cherry picked from commit 19a30e527133d06eea3dabc9f3b15011c2c1ad9a)
Reviewed-on: http://git-master/r/426354
Reviewed-by: Mitch Luban <mluban@nvidia.com>
GVS: Gerrit_Virtual_Submit