dt-compat.c implemented bindings for following compatibles:

	atmel,at91rm9200-clk-main-osc
	atmel,at91sam9x5-clk-main-rc-osc
	atmel,at91rm9200-clk-main
	atmel,at91sam9x5-clk-main
	atmel,at91rm9200-clk-master
	atmel,at91sam9x5-clk-master
	atmel,at91rm9200-clk-peripheral
	atmel,at91sam9x5-clk-peripheral
	atmel,at91rm9200-clk-pll
	atmel,sama5d3-clk-pll
	atmel,at91sam9x5-clk-plldiv
	atmel,at91rm9200-clk-programmable
	atmel,at91sam9g45-clk-programmable
	atmel,at91sam9x5-clk-programmable
	atmel,at91sam9x5-clk-smd
	atmel,at91rm9200-clk-system
	atmel,at91sam9x5-clk-usb
	atmel,at91sam9n12-clk-usb
	atmel,at91rm9200-clk-usb
	atmel,at91sam9x5-clk-utmi

With the recent v5.8-rc1 sync, we no longer have any device trees in
the barebox repository that use these. Unlike Linux, we don't need to
support probing from old device trees, so drop the now unused code.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>