Restore synchronous probing for wm8994 regulators because otherwise the
sound device is never initialized on Exynos5250-based Arndale board.

Fixes: 259b93b2 ("regulator: Set PROBE_PREFER_ASYNCHRONOUS for drivers that existed in 4.14")
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20230323083312.199189-1-m.szyprowski@samsung.comSigned-off-by: Mark Brown <broonie@kernel.org>