linux-yocto(-tiny-kexecboot): collie: fixup for mtd resume after pm suspend

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
mininit: update SRC_URI and move to v. 2.0.2

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
linux-yocto-tiny-kexecboot_3.17: add rdinit=/usr/bin/kexecboot to the cmdline

The kernel behavior has changed and apparently the init symlink
in the initramfs is ignored (no init seems executed).

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>