Bluetooth: hci_bcm: Use "txco" and "extclk" to get clock reference

Originally the device tree binding only specified one clock reference,
with the name "extclk". The driver simply retrieves the clock without
bothering to specify a name.

Since we added a second clock to the binding, we need to fetch the
clocks by name now. First we try the new name "txco", then fall back
to the old name "extclk", and finally try retrieving a clock without
using any name, to cover any instances where a bad device tree or
firmware worked by accident.

In the last case, we should take care that we don't get the same
clock twice when we add support for the "lpo" clock.

Tested-by: Ondrej Jirman <[email protected]>
Signed-off-by: Chen-Yu Tsai <[email protected]>
Signed-off-by: Marcel Holtmann <[email protected]>

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