ARM: at91/dt: sama5d2: add missing devices

Big update of the sama5d2.dtsi file since many patches have reached te
mainline:
- add generated clocks
- enable crypto devices
- add flexcom devices
- add tdes device
- add sdmmc devices

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>