ARM: dts: aspeed: rainier: Fix pca9551 nodes

The pca9551 compatible LED drivers are under the pca9546 mux
on Rainier pass > 1. On pass 1, they are directly connected to
the aspeed i2c.

Signed-off-by: Santosh Puranik <santosh.puranik@in.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20221102223554.1738642-1-joel@jms.id.au