HV:Remove i/o session sw interface from hypervisor shell

to remove it as no requirement of bounding i/o handlers
  dynamically in hypervisor shell

  - update source code related with i/o session

  - move shell command definitions from shell_pulic.c
    to shell_internal.c

  - remove shell_public.c

Signed-off-by: Yonghua Huang <yonghua.huang@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/debug/console.c

@@ -43,7 +43,7 @@ static void console_handler(void)
 		/* serial Console Tx operation */
 		vuart_console_tx_chars(vu);
 	} else {
-		shell_kick_session();
+		shell_kick();
 	}
 }