ARM: dts: lan966x: Add otp support

Add OTP (one time programmable) support.
The both lan966x SocS (lan9662 and lan9668) have the same OTP IP.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20220916194946.2869510-1-horatiu.vultur@microchip.com