ARM: at91: move at91rm9200 SoC to the CCF

This patch removes the selection of AT91_USE_OLD_CLK when selecting at91rm9200
SoC support. This will automatically enable COMMON_CLK_AT91 option and add
support for at91 common clk implementation.
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: NBoris BREZILLON <boris.brezillon@free-electrons.com>
Acked-by: NNicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/mach-at91/Kconfig

@@ -113,7 +113,6 @@ config SOC_AT91RM9200
 	select HAVE_AT91_DBGU0
 	select MULTI_IRQ_HANDLER
 	select SPARSE_IRQ
-	select AT91_USE_OLD_CLK
 	select HAVE_AT91_USB_CLK
 
 config SOC_AT91SAM9260