Meta: Set the Pi 5 "framebuffer_depth" config.txt option to 32

Otherwise we get a 16-bit framebuffer.

Author: spholz

Meta/build-image-raspberry-pi.sh

@@ -115,6 +115,10 @@ kernel=Kernel.bin
 [pi4]
 # We use UART0 as the console.
 dtoverlay=disable-bt
+
+[pi5]
+# We only support 32-bit framebuffers.
+framebuffer_depth=32
 EOF
 
 echo "serial_debug root=block100:1" >boot/cmdline.txt