qcacmn: Remove function prototype for hif_get_dev_ba from c file

Function prototype for hif_get_dev_ba is added in hal_sng.c to avoid
warning. This should be ideally added in header file. Removing the
prototype from c file.

Change-Id: I3220765b1dbc8a2cd5a45ccfe85fde09aee12a00
CRs-Fixed: 1079655

hal/wifi3.0/hal_srng.c

@@ -490,9 +490,6 @@ static struct hal_hw_srng_config hw_srng_table[] = {
 	},
 };
 
-/* TODO: Need this interface from HIF layer */
-void *hif_get_dev_ba(void *hif_hanle);
-
 /**
  * hal_attach - Initalize HAL layer
  * @hif_handle: Opaque HIF handle