clk: Add a devm variant of clk_rate_exclusive_get()

This allows to simplify drivers that use clk_rate_exclusive_get()
in their probe routine as calling clk_rate_exclusive_put() is cared for
automatically.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20240104225512.1124519-2-u.kleine-koenig@pengutronix.de
Acked-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>