armhf: Replace u-boot package with specific variant
The u-boot metapackage has been dropped for armhf architecture. Replace it with a specific variant such as u-boot-sunxi, u-boot-rpi, or u-boot-omap.
Closes: #208 (closed).
Tests:
- Successfully build unstable images for the following targets:
- a20-olinuxino-lime
- a20-olinuxino-lime2
- a20-olinuxino-micro
- banana-pro
- beaglebone
- cubieboard2
- cubietruck
- lamobo-r1
- orange-pi-zero
- pcduino3
- raspberry2
- raspberry3
- raspberry3-b-plus
Signed-off-by: James Valleroy jvalleroy@mailbox.org