regulator: sy8824x: use c++style for the comment block near SPDX

Update the entire comment block to be C++ style so it looks consistent.

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Link: https://lore.kernel.org/r/20190829143749.4b42bc65@xhacker.debian


Signed-off-by: Mark Brown <broonie@kernel.org>