support for LS1028A and A311D and latest u-boot

See merge request !58

 - with old u-boot imx modules can show up with 2G ram which breaks cma=512M@3G
 - cma=512M@3G is only required on ls1028a but not on a311d

flash-kernel/ubootenv.d/00reform2_ubootenv: respect ${bootargs} again

See merge request !57

stop installing /usr/share/u-boot-menu/conf.d/reform.conf as it does not allow for platform specific settings -- use /etc/default/u-boot instead

00reform2_ubootenv: put console=tty1 at the end of the cmdline to make sure that luks passphrase prompt shows up there and not on the serial line

bin/reform-check: warn about /etc/flash-kernel/preboot.d/00reform2_preboot and /etc/flash-kernel/ubootenv.d/00reform2_ubootenv

debian/changelog: gbp dch && dch -r

See merge request !56