Add script for AVR style check.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@15911 27425a3e-05d8-49a3-a47f-9c15f0e5edd8

tools/style/style_avr_demos.sh

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+#!/bin/bash
+find ../../demos/AVR -name "*.[ch]" -exec perl stylecheck.pl "{}" \;

tools/style/style_avr_lld.sh

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+#!/bin/bash
+find ../../os/hal/ports/AVR/ -name "*.[ch]" -exec perl stylecheck.pl "{}" \;

tools/style/style_avr_testhal.sh

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+#!/bin/bash
+find ../../testhal/AVR -name "*.[ch]" -exec perl stylecheck.pl "{}" \;