scripts: Initial import of gpio state parsing code

This is a script that uses the module+app to try and capture the state and
names of gpios to aid in supporting new boards.
scripts: try testing for busybox

And use for loops that work without bash.
scripts: don't try modprobe, it needs maps

We should improve the tests and use lsmod/insmod

Signed-off-by: Karl Palsson <karlp@tweak.net.au>
scripts: use a subdirectory for scripts
Merge pull request #1 from linux-rockchip/pulls/karlp-scripts

add gpio dump script from wiki