busybox (initramfs): add applet 'basename'

Signed-off-by: Stephan Raue <stephan@openelec.tv>
u-boot: install bootloaderfiles to /usr/share/bootloader

Signed-off-by: Stephan Raue <stephan@openelec.tv>
linux: install bootloaderfiles to /usr/share/bootloader

Signed-off-by: Stephan Raue <stephan@openelec.tv>
projects/Cuboxi: add bootloader update script

Signed-off-by: Stephan Raue <stephan@openelec.tv>