iio: core: Replace BUG() with WARN_ON_ONCE() and error return

As documented in Documentation/process/deprecated.rst, the
use of BUG() and BUG_ON() should be avoided as they could
cause a complete system crash, preventing further debugging.

In iio_get_time_ns() and current_timestamp_clock_show(), the
clock type is already validated against supported clock
types prior to these calls, making the default switch
branches expected to be unreachable. Replace these with
WARN_ON_ONCE(1) followed by an error return to avoid a
crash and to log the highly unexpected condition.

Signed-off-by: Rishab Madhugiri <rishab.madhugiri@gmail.com>
Signed-off-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>

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