linux-phytec-fsl

ARM: at91/dt: at91sam9g20: switch ssc compatible string

As the SSC integrate in at91sam9g20 support frame sync length
extension, so switch compatible string to support this feature.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>