ARM: dts: at91: at91-cosino: remove leftovers clock definition

The clocks group properties and the clock@0 node have been obsolete for two
years, remove them.

Cc: Rodolfo Giometti <giometti@linux.it>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>