iquik: change dir/file names

iquik -> loader

loader/iquik -> loader/iquik.elf

Signed-off-by: Andrei Warkentin <andrey.warkentin@gmail.com>
quik: build with size optimizations.

This shaves off quite a bit of fat.

Signed-off-by: Andrei Warkentin <andrey.warkentin@gmail.com>