i3c: controllers do not need to depend on I3C

The Kconfig file for controller drivers is only sourced if the I3C
symbol is enabled. No need to check for that in individual drivers.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20250506075247.1545-2-wsa+renesas@sang-engineering.com


Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>