Pull up following revision(s) (requested by jmcneill in ticket #17):
sys/arch/arm/fdt/aaci_fdt.c: revision 1.1
sys/arch/arm/fdt/files.fdt: revision 1.10
sys/arch/evbarm/conf/VEXPRESS_A15: revisions 1.14, 1.15
sys/conf/files: revision 1.1174
sys/dev/ic/pl041.c: revisions 1.1-1.3
sys/dev/ic/pl041var.h: revision 1.1
Add driver for ARM PrimeCell Advanced Audio CODEC interface (PL041).
Don't expect this driver to work on real hardware, but QEMU emulates it.
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Add fdt glue for ARM PrimeCell Advanced Audio CODEC interface (PL041).
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Add aaci at fdt, commented out for now. Driver should work (tm) but QEMU
and my old Thinkpad can't seem to keep up.
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Fix two bugs:
- Inverted test for fifo status in aaci_write_data
- Return success from trigger_output (thanks nat)
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Enable aaci
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bus_space_write_multi_4 takes a count, not number of bytes. With this,
audio works in qemu.

(snj)