Bump U-Boot to 2019.07 and kernel to version 5.1.16.
Also
- adjust the U-Boot binary name after DM conversion.
- add missing notes about DFU
Signed-off-by: Pierre-Jean Texier <pjtexier@koncepto.io>
Tested-by: Joris Offouga <offougajoris@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>