clk: Renesas versaclock7 ccf device driver

Renesas Versaclock7 is a family of configurable clock generator ICs
with fractional and integer dividers. This driver has basic support
for the RC21008A device, a clock synthesizer with a crystal input and
8 outputs. The supports changing the FOD and IOD rates, and each
output can be gated.

Signed-off-by: Alex Helms <alexander.helms.jy@renesas.com>
Link: https://lore.kernel.org/r/20220912183613.22213-3-alexander.helms.jy@renesas.com


Tested-by: Saeed Nowshadi <saeed.nowshadi@amd.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>