ASoC: allow drivers to compile both static and dynamic

Based on where the code is synced the driver should allow
both static and dynamic linked compilation.
Also remove __exit for modules loaded from another common
init/exit functions.

Change-Id: Ib58f152002aba3af4446f9bbd9b82c279212bd0a
Signed-off-by: Asish Bhattacharya <asishb@codeaurora.org>

dsp/adsp_err.c

@@ -167,7 +167,7 @@ int __init adsp_err_init(void) { return 0; }
 
 #endif
 
-void __exit adsp_err_exit(void)
+void adsp_err_exit(void)
 {
 	return;
 }