scripts/mkimage: install config.txt to image

Signed-off-by: Stephan Raue <stephan@openelec.tv>
projects/RPi/patches: update RPi patch

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xbmc: add PR4290

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xbmc: add PR4296

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xbmc: add upstream patch

Signed-off-by: Stephan Raue <stephan@openelec.tv>
busybox: init: set rsize/wsize for nfs