[PATCH v2 0/2] ASoC: kirkwood: fix loss of external clock at probe time

This patch series fixes the loss of clock when the requested clock
device is not yet initialized at probe time.

The first patch adds a -EPROBE_DEFER when the clock referenced by a
phandle is not available.

The second patch uses this feature to fix such a problem in the
kirkwood audio driver.

v2:
- return the probe defer from the clock subsystem (Marc Brown remark)

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