ARM: dts: at91: Use the generic "crypto" node name for the crypto IPs

The DT specification recommeds that:
"The name of a node should be somewhat generic, reflecting the function of
the device and not its precise programming model. If appropriate, the name
should be one of the following choices:"
"crypto" being the recommendation for the crypto nodes. Follow the DT
recommendation and use the generic "crypto" node name for the at91 crypto
IPs. While at this, add labels to the crypto nodes where they missed, for
easier reference purposes.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20220208111225.234685-1-tudor.ambarus@microchip.com