clk: npcm8xx: add clock controller

clk: npcm8xx: add clock controller

Add auxiliary driver to support Nuvoton Arbel BMC NPCM8XX contains an
integrated clock controller which generates and supplies clocks to all
modules within the BMC.

The NPCM8xx clock controller is created using the auxiliary device
framework and set up in the npcm reset driver since the NPCM8xx clock is
using the same register region.

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
Tested-by: Benjamin Fair <benjaminfair@google.com>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20240912191038.981105-4-tmaimon77@gmail.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>