kernel: move do_padconf and add a test case

padconf is specific to arm, so it's being moved to kernel/arch/earm.

Add a test case to ensure the proper error is returned on non-ARM
systems.

Change-Id: I07ebbe64825d59bc0ef9c818d3d54891dafb4419

kernel/arch/earm/Makefile.inc

@@ -63,7 +63,7 @@ ORIG_UNPAGED_OBJS += ${unpaged_obj}
 
 CLEANFILES+= ${ORIG_UNPAGED_OBJS}
 
-SRCS+=	mpx.S arch_clock.c arch_do_vmctl.c arch_system.c \
+SRCS+=	mpx.S arch_clock.c arch_do_vmctl.c arch_system.c do_padconf.c \
 	omap_serial.c omap_timer.c omap_padconf.c omap_intr.c omap_rtc.c \
 	omap_reset.c exception.c klib.S memory.c \
 	protect.c direct_tty_utils.c arch_reset.c \

kernel/system/Makefile.inc

@@ -40,11 +40,6 @@ SRCS+= 	\
 	do_schedctl.c \
 	do_statectl.c
 
-.if ${MACHINE_ARCH} == "earm"
-SRCS+=	\
-	do_padconf.c
-.endif
-
 .if ${MACHINE_ARCH} == "i386"
 SRCS+=  \
 	do_devio.c \