ImageAccess abstraction for later RoT update_server caboose access and rollback protection.

Author: lzrd

app/lpc55xpresso/app.toml

@@ -48,7 +48,7 @@ start = true
 [tasks.update_server]
 name = "lpc55-update-server"
 priority = 3
-max-sizes = {flash = 26720, ram = 16704}
+max-sizes = {flash = 27008, ram = 16704}
 stacksize = 8192
 start = true
 sections = {bootstate = "usbsram"}