OMAP850: PM: Add an ARCH_OMAP850 check

This just makes the same warning be printed on omap850 and omap730.
Signed-off-by: Alistair Buxton <a.j.buxton@gmail.com>

arch/arm/mach-omap1/pm.h

@@ -105,6 +105,7 @@
 #define OMAP7XX_IDLE_LOOP_REQUEST	0x0C00
 
 #if     !defined(CONFIG_ARCH_OMAP730) && \
+	!defined(CONFIG_ARCH_OMAP850) && \
 	!defined(CONFIG_ARCH_OMAP15XX) && \
 	!defined(CONFIG_ARCH_OMAP16XX)
 #warning "Power management for this processor not implemented yet"