azalia: Make set_bits function non-static

There's many copies of this function in the tree. Make the copy in
azalia_device.c non-static and rename it to `azalia_set_bits`, then
replace all other copies with it. Since azalia_device.c is only built
when AZALIA_PLUGIN_SUPPORT is selected, select it where necessary.

This has the side-effect of building hda_verb.c from the mainboard
directory. If this patch happens to break audio on a mainboard, it's
because its hda_verb.c was always wrong but wasn't being compiled.

Change-Id: Iff3520131ec7bc8554612969e3a2fe9cdbc9305e
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48346
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

src/include/device/azalia_device.h

@@ -18,6 +18,7 @@
 #define   HDA_ICII_BUSY		(1 << 0)
 #define   HDA_ICII_VALID	(1 << 1)
 
+int azalia_set_bits(void *port, u32 mask, u32 val);
 void azalia_audio_init(struct device *dev);
 extern struct device_operations default_azalia_audio_ops;