usb: chipidea: Fix memleak for ci->hw_bank.regmap when removal

It needs to free ci->hw_bank.regmap explicitly since it is not managed
resource.
Signed-off-by: NPeter Chen <peter.chen@freescale.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/chipidea/core.c

@@ -605,6 +605,7 @@ static int ci_hdrc_remove(struct platform_device *pdev)
 	dbg_remove_files(ci);
 	free_irq(ci->irq, ci);
 	ci_role_destroy(ci);
+	kfree(ci->hw_bank.regmap);
 
 	return 0;
 }