AT91 DT for 5.3

 - switch to new sckc bindings
 - convert soc bindings to json-schema

* tag 'at91-5.3-dt' of git://git.kernel.org/pub/scm/linux/kernel/git/at91/linux:
  dt-bindings: arm: Convert Atmel board/soc bindings to json-schema
  ARM: dts: at91: sama5d3: switch to new sckc bindings
  ARM: dts: at91: at91sam9rl: switch to new sckc bindings
  ARM: dts: at91: at91sam9g45: switch to new sckc bindings
  ARM: dts: at91: at91sam9x5: switch to new sckc bindings
  ARM: dts: at91sam9261ek: remove unused chosen nodes
Signed-off-by: Olof Johansson <olof@lixom.net>