Remove the ARM_DEVICE_MULTIPASS option and make its effect be the default.

Multipass device attachment was tested on many arm platforms by users and
only success was reported on the arm@ mailing list.  This is just the
long-delayed followup of making it the default.

Multipass attachment is necessary when using vendor-supplied FDT data,
because our devices may need to be attached in a different order than they
are described in the FDT data.

sys/arm/arm/nexus.c

@@ -128,12 +128,8 @@ static driver_t nexus_driver = {
 	nexus_methods,
 	1			/* no softc */
 };
-#ifdef ARM_DEVICE_MULTIPASS
 EARLY_DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0, 
     BUS_PASS_BUS + BUS_PASS_ORDER_EARLY);
-#else
-DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
-#endif
 
 static int
 nexus_probe(device_t dev)

sys/arm/at91/std.atmel

@@ -12,4 +12,3 @@ device		at91sam9x5
 # bring in the sam specific timers and such
 device		at91sam9
 
-options		ARM_DEVICE_MULTIPASS

sys/conf/options.arm

@@ -1,7 +1,6 @@
 #$FreeBSD$
 ARM9_CACHE_WRITE_THROUGH	opt_global.h
 ARM_CACHE_LOCK_ENABLE	opt_global.h
-ARM_DEVICE_MULTIPASS	opt_global.h
 ARM_KERN_DIRECTMAP	opt_vm.h
 ARM_L2_PIPT		opt_global.h
 ARM_MANY_BOARD		opt_global.h