avr: update sample to use up-to-date gcc

With avr-libc 2.0.0 released, we no longer need to force gcc 4.9.x for
the avr toolchain. So, remove the gcc version constraint and allow it to
follow the default gcc version. There is also no need to force companion
libraries' versions anymore.
The 'experimental' flag was also removed from the description as it
seems to be following upstream development now.

This sample has been build tested on Arch Linux and Ubuntu 14.04 hosts.

Signed-off-by: Erico Nunes <nunes.erico@gmail.com>

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