ACPICA: Move all public H/W interfaces to new hwxface

Move public interfaces from hwregs.c to new file, hwxface.c -
similar to the structure of the other ACPICA components.
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/acpi/hardware/Makefile

@@ -2,7 +2,7 @@
 # Makefile for all Linux ACPI interpreter subdirectories
 #
 
-obj-y := hwacpi.o  hwgpe.o  hwregs.o  hwsleep.o
+obj-y := hwacpi.o  hwgpe.o  hwregs.o  hwsleep.o hwxface.o
 
 obj-$(ACPI_FUTURE_USAGE) += hwtimer.o