OMAP2xxx EAC: fix sparse warnings

This patch resolves the following two sparse warnings:

sound/arm/omap/eac.c:788:12: warning: symbol 'eac_init' was not declared. Should it be static?
sound/arm/omap/eac.c:793:13: warning: symbol 'eac_exit' was not declared. Should it be static?
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

sound/arm/omap/eac.c

@@ -787,12 +787,12 @@ static struct platform_driver eac_driver = {
 	.remove		= eac_remove,
 };
 
-int __init eac_init(void)
+static int __init eac_init(void)
 {
 	return platform_driver_register(&eac_driver);
 }
 
-void __exit eac_exit(void)
+static void __exit eac_exit(void)
 {
 	platform_driver_unregister(&eac_driver);
 }