[ARM] Move AMBA bus code to drivers/amba/

Make the AMBA bus code visible to other architectures.

Signed-off-by: Russell King <[e-mail]>

arch/arm/common/Makefile

···
 #
 
 obj-y				+= rtctime.o
-obj-$(CONFIG_ARM_AMBA)		+= amba.o
 obj-$(CONFIG_ARM_GIC)		+= gic.o
 obj-$(CONFIG_ICST525)		+= icst525.o
 obj-$(CONFIG_ICST307)		+= icst307.o

drivers/Makefile

···
 # PnP must come after ACPI since it will eventually need to check if acpi
 # was used and do nothing if so
 obj-$(CONFIG_PNP)		+= pnp/
+obj-$(CONFIG_ARM_AMBA)		+= amba/
 
 # char/ comes before serial/ etc so that the VT console is the boot-time
 # default.

drivers/amba/Makefile

···
+obj-y		+= bus.o
+