This reverts commit 58973046 ("regulator: qcom-rpmh: Use
PROBE_FORCE_SYNCHRONOUS"). Further digging into the problems that
prompted the us to switch to synchronous probe showed that the root
cause was a missing "rootwait" in the kernel command line
arguments. Let's reinstate asynchronous probe.

Fixes: 58973046 ("regulator: qcom-rpmh: Use PROBE_FORCE_SYNCHRONOUS")
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20230324063357.1.Ifdf3625a3c5c9467bd87bfcdf726c884ad220a35@changeidSigned-off-by: Mark Brown <broonie@kernel.org>