clk: add pxa27x clock drivers

Move pxa27x clock drivers from arch/arm/mach-pxa to driver/clk.
In the move :
 - convert to new clock framework legacy clocks
 - provide clocks as before for platform data based boards
 - provide clocks through devicetree

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
diff --git a/drivers/clk/pxa/Makefile b/drivers/clk/pxa/Makefile
index cb2bd8f..4ff2abc 100644
--- a/drivers/clk/pxa/Makefile
+++ b/drivers/clk/pxa/Makefile
@@ -1 +1,2 @@
 obj-y				+= clk-pxa.o
+obj-$(CONFIG_PXA27x)		+= clk-pxa27x.o