ARM: dts: aspeed: rainier and everest: Remove PCA gpio specification

Specifying gpio nodes under PCA led controllers no longer does anything,
so remove those nodes in the device trees.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20211020215321.33960-3-eajames@linux.ibm.com


Signed-off-by: Joel Stanley <joel@jms.id.au>