avr32: Move sleep code into mach-at32ap

Create a new file, pm-at32ap700x.S, in mach-at32ap and move the CPU
idle sleep code there. Make it possible to disable the sleep code.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
diff --git a/arch/avr32/mach-at32ap/Makefile b/arch/avr32/mach-at32ap/Makefile
index 5e9f821..83cab2a 100644
--- a/arch/avr32/mach-at32ap/Makefile
+++ b/arch/avr32/mach-at32ap/Makefile
@@ -1,4 +1,4 @@
 obj-y				+= at32ap.o clock.o intc.o extint.o pio.o hsmc.o
-obj-$(CONFIG_CPU_AT32AP700X)	+= at32ap700x.o
+obj-$(CONFIG_CPU_AT32AP700X)	+= at32ap700x.o pm-at32ap700x.o
 obj-$(CONFIG_CPU_AT32AP700X)	+= time-tc.o
 obj-$(CONFIG_CPU_FREQ_AT32AP)	+= cpufreq.o