mfd: wcd9xxx: Add WCD9304 1.2 version codec chip entry

-Add chip byte information for WCD9304 1.2 version.
 This information is required for correct detection
 of the codec at the codec init.
-Fix code to exit codec init with error, if codec
 detection fails.

Change-Id: I6b5522f6fb4d7b18011da2bedd322c4a480a5175
Signed-off-by: Venkat Sudhir <vsudhir@codeaurora.org>