ASoC: lahaina: check if codec is enabled

Add support to check if a codec is enabled/disabled in
device tree. Some codecs can be disabled on some platforms
while being enabled on others, so before registering with
sound card check if a codec is enabled.

Change-Id: Idcd0989de9fa70a2fd21c7fd2abc9e9efa02480d
Signed-off-by: Vignesh Kulothungan <vigneshk@codeaurora.org>