[ARM] 4187/1: iop: unify time implementation across iop32x, iop33x, and iop13xx

* architecture specific details are handled in asm/arch/time.h
* ARCH_IOP13XX now selects PLAT_IOP
* as suggested by Lennert use ifdef CONFIG_XSCALE to skip the cp_wait on
XSC3

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/plat-iop/Makefile b/arch/arm/plat-iop/Makefile
index 3250d73..4d2b1da 100644
--- a/arch/arm/plat-iop/Makefile
+++ b/arch/arm/plat-iop/Makefile
@@ -24,6 +24,7 @@
 
 # IOP13XX
 obj-$(CONFIG_ARCH_IOP13XX) += cp6.o
+obj-$(CONFIG_ARCH_IOP13XX) += time.o
 
 obj-m                  :=
 obj-n                  :=