ARM: dts: aspeed-g5: Remove ngpios from sgpio node.

Remove ngpios property from sgpio node as it should be defined in the
platform dts.

Signed-off-by: Steven Lee <steven_lee@aspeedtech.com>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Link: https://lore.kernel.org/r/20210712100317.23298-5-steven_lee@aspeedtech.com


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