Rename kfree to kmm_free for consistency with other naming conventions

drivers/usbdev/cdcacm.c

@@ -2310,7 +2310,7 @@ int cdcacm_classobject(int minor, FAR struct usbdevclass_driver_s **classdev)
   return OK;
 
 errout_with_class:
-  kfree(alloc);
+  kmm_free(alloc);
   return ret;
 }
 
@@ -2415,7 +2415,7 @@ void cdcacm_uninitialize(FAR void *handle)
        * free the memory resources.
        */
 
-      kfree(priv);
+      kmm_free(priv);
       return;
     }
 #endif
@@ -2445,7 +2445,7 @@ void cdcacm_uninitialize(FAR void *handle)
 
   /* And free the driver structure */
 
-  kfree(priv);
+  kmm_free(priv);
 
 #else
   /* For the case of the composite driver, there is a two pass

drivers/usbdev/composite.c

@@ -851,7 +851,7 @@ FAR void *composite_initialize(void)
   return (FAR void *)alloc;
 
 errout_with_alloc:
-  kfree(alloc);
+  kmm_free(alloc);
   return NULL;
 }
 
@@ -901,7 +901,7 @@ void composite_uninitialize(FAR void *handle)
 
   /* Then free the composite driver state structure itself */
 
-  kfree(priv);
+  kmm_free(priv);
 }
 
 /****************************************************************************

drivers/usbdev/pl2303.c

@@ -2368,6 +2368,6 @@ int usbdev_serialinitialize(int minor)
 errout_with_class:
   usbdev_unregister(&drvr->drvr);
 errout_with_alloc:
-  kfree(alloc);
+  kmm_free(alloc);
   return ret;
 }

drivers/usbdev/usbmsc.c

@@ -1771,7 +1771,7 @@ void usbmsc_uninitialize(FAR void *handle)
        * free the memory resources.
        */
 
-      kfree(priv);
+      kmm_free(priv);
       return;
     }
 #endif
@@ -1818,13 +1818,13 @@ void usbmsc_uninitialize(FAR void *handle)
       usbmsc_lununinitialize(&priv->luntab[i]);
     }
 
-  kfree(priv->luntab);
+  kmm_free(priv->luntab);
 
   /* Release the I/O buffer */
 
   if (priv->iobuffer)
     {
-      kfree(priv->iobuffer);
+      kmm_free(priv->iobuffer);
     }
 
   /* Uninitialize and release the driver structure */
@@ -1840,6 +1840,6 @@ void usbmsc_uninitialize(FAR void *handle)
    * second pass because of priv->thpid == 0)
    */
 
-  kfree(priv);
+  kmm_free(priv);
 #endif
 }