clk: scmi: Postpone clock name resolution

clk: scmi: Postpone clock name resolution

The clock names are retrived via SCMI_CLOCK_ATTRIBUTES, called for each
clock ID. This may take a lot of time to complete and is not strictly
necessary. Register each clock as "scmi-%zu" instead, and let the first
call of SCMI_CLOCK_ATTRIBUTES fill in the actual clock name.

This has a side effect, which can be considered both an upside and also
a downside. Unused clock are never renamed and retain their placeholder
"scmi-%zu" name, which avoids empty clock names for nameless SCMI clock,
and avoids the name resolution and improves boot time. But for those
SCMI clock which do have name, that name is not listed until the clock
are used.

This is a preparatory patch for deferred issue of SCMI_CLOCK_ATTRIBUTES.

Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Peng Fan <peng.fan@nxp.com>