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Add a beep command that's compatible with GRUB's
play "tempo pitch1 duration1..."
Unlike the GRUB command, playing a tune is not a blocking operating.
For this reason barebox, additionally supports:
* -w: wait until tune is over
* -c: cancel playing tune
Additionally, `beep tempo` can be used to ring the bell at a frequency
chosen by the sound card.
Examples:
# 1-up
beep 1750 523 1 392 1 523 1 659 1 784 1 1047 1 784 1 415 1 523 \
1 622 1 831 1 622 1 831 1 1046 1 1244 1 1661 1
# 1-second beep
beep 60
Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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