uboot-fritz4040: update to 2019-09-07
572ff7f fritzcreator: actually add checksum spacer
6edce1a fritzcreator: replace obscure padding generation with something more portable
2ff189f add ASUS RT-AC58U "easy install" factory u-boot shim
b91f9c2 readd spi-nand support
486ae53 improve cmd_sysupgrade
b0933f1 replace sstrip with strip
882e48a do not include generated files into git
0c5aa5f fix bugs in ipq40xx_cdp.c
Signed-off-by: David Bauer <mail@david-bauer.net>
(cherry picked from commit
af63436d2d0dc3c07d1cb11b018e486994942c6c)