hal: Fix for hang during unloading of primary hal

- Creating keep-alive twice was causing keep alive to
  be in improper state.
- To fix this issue, removed duplicate keep_alive_init
  from platform_init.

Change-Id: Id286ebc69712bc58766f775f7f92c516ea25a6af
diff --git a/hal/msm8974/platform.c b/hal/msm8974/platform.c
index f47604f..f149e84 100644
--- a/hal/msm8974/platform.c
+++ b/hal/msm8974/platform.c
@@ -2298,8 +2298,6 @@
         }
     }
 
-    /* init keep-alive for compress passthru */
-    audio_extn_keep_alive_init(adev);
 #ifdef DYNAMIC_LOG_ENABLED
     log_utils_init();
 #endif