mfd: twl4030-audio: Remove MODULE_LICENSE in non-modules

Since commit 8b41fc4454 ("kbuild: create modules.builtin without
Makefile.modbuiltin or tristate.conf"), MODULE_LICENSE declarations
are used to identify modules. As a consequence, uses of the macro
in non-modules will cause modprobe to misidentify their containing
object file as a module when it is not (false positives), and modprobe
might succeed rather than failing with a suitable error message.

So remove it in the files in this commit, none of which can be built as
modules.

Signed-off-by: Nick Alcock <nick.alcock@oracle.com>
Suggested-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Lee Jones <lee@kernel.org>

drivers/mfd/twl4030-audio.c

@@ -285,5 +285,4 @@ module_platform_driver(twl4030_audio_driver);
 
 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
 MODULE_DESCRIPTION("TWL4030 audio block MFD driver");
-MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:twl4030-audio");