sabrelite HW setup: update BOOT switch description for U-Boot flushing

Use 'internal' boot mode for the default boot.
Update photos of BOOT switch used during U-Boot flush to
be more human-friendly on resized page.

Signed-off-by: Denis Pynkin <denis.pynkin@collabora.com>

content/reference_hardware/imx6q_sabrelite_setup.md

@@ -44,8 +44,8 @@ programmed onto the SD card.
 
 |        |          |                                                                      |
 | ------ | -------- | -------------------------------------------------------------------- |
-| Switch | Position | ![200px](/images/imx6q-sabrelite-boot-usb-otg-switches.jpeg) |
-| SW1.1  | 0        |                                                                      |
+| Switch | Position | ![200px](/images/imx6q-sabrelite-boot-internal-switches.jpeg) |
+| SW1.1  | 1        |                                                                      |
 | SW1.2  | 0        |                                                                      |
 
 - Power up the SABRE Lite.
@@ -153,8 +153,8 @@ a USB to microUSB cable.
 
 |        |          |                                                                      |
 | ------ | -------- | -------------------------------------------------------------------- |
-| Switch | Position | ![200px](/images/imx6q-sabrelite-boot-usb-otg-switches.jpeg) |
-| SW1.1  | 0        |                                                                      |
+| Switch | Position | ![200px](/images/imx6q-sabrelite-boot-internal-switches.jpeg) |
+| SW1.1  | 1        |                                                                      |
 | SW1.2  | 0        |                                                                      |