Update DVI examples

Move display2 to Example 1 (can cause funky behavior in example 2)
Fix camera using the correct buffer

Author: sfe-SparkFro

red_vision_examples/dvi_examples/ex01_hello_dvi.py

@@ -105,3 +105,19 @@
 if display._buffer_is_in_psram:
     import gc
     gc.collect()
+
+# If the ST7789 display is also connected, it can be controlled independently
+# of the DVI display. For example, we can show a splash screen on it:
+from red_vision.displays import st7789_pio
+spi = machine.SPI(baudrate=24_000_000)
+display2 = st7789_pio.ST7789_PIO(
+    width = 240,
+    height = 320,
+    sm_id = 4,
+    pin_clk = 22,
+    pin_tx = 23,
+    pin_dc = 20,
+    pin_cs = 21,
+    rotation = 1
+)
+display2.splash("red_vision_examples/images/splash.png")

red_vision_examples/dvi_examples/ex02_high_fps_camera.py

@@ -78,26 +78,10 @@
     pin_pclk = 40,
     pin_xclk = 44, # Optional xclock pin, specify if needed
     xclk_freq = 20_000_000,
-    buffer = display._buffer,
+    buffer = buffer,
     continuous = True,
 )
 
 # Open the camera to start the continuous capture process.
 camera.open()
 camera._capture()
-
-# If the ST7789 display is also connected, it can be controlled independently
-# of the DVI display. For example, we can show a splash screen on it:
-from red_vision.displays import st7789_pio
-spi = machine.SPI(baudrate=24_000_000)
-display2 = st7789_pio.ST7789_PIO(
-    width = 240,
-    height = 320,
-    sm_id = 4,
-    pin_clk = 22,
-    pin_tx = 23,
-    pin_dc = 20,
-    pin_cs = 21,
-    rotation = 1
-)
-display2.splash("red_vision_examples/images/splash.png")