fix(lcd): reserve the GPIOs used by RGB LCD

and disconnect the LCD signals when the dirver is uninstalled.

components/soc/esp32s3/lcd_periph.c

@@ -64,6 +64,7 @@ const lcd_rgb_signal_conn_t lcd_periph_rgb_signals = {
             .vsync_sig = LCD_V_SYNC_IDX,
             .pclk_sig = LCD_PCLK_IDX,
             .de_sig = LCD_H_ENABLE_IDX,
+            .disp_sig = SIG_GPIO_OUT_IDX,
         }
     }
 };