mfd: idt8a340_reg: Start comments with '/*'

Several comments in idt8a340_reg.h start with '/**', which denotes the
start of a Kernel doc, but are otherwise not Kernel docs.

Resolve this conflict by starting these comments with '/*' instead.

Flagged by ./scripts/kernel-doc -none

Signed-off-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240507-clockmatrix-kernel-doc-v2-1-3138d74192dd@kernel.org


Signed-off-by: Lee Jones <lee@kernel.org>