schulung_tools: hellodriver: add patches for use with leds

These patches are based heavily on the work by Manu to make the
driver lessons more interesting. Rather than create a new driver,
I took his work and created a series of patches that do
interesting modifications to the hello driver.

These patches can be used together with the "leds" program to
do live blinking demonstrations.

Signed-off-by: John Ogness <john.ogness@linutronix.de>

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