avr32: work-in-progress

committed so as to ease cooperation and to let it be improved
over time.

So far it supports:
- halt/resume
- registers inspection
- memory inspection/modification

I'm still getting up to speed with OpenOCD internals and AVR32 so code is a little
bit messy and I'd appreciate any feedback.

src/target/Makefile.am

@@ -32,6 +32,7 @@ libtarget_la_SOURCES = \
 	$(ARMV6_SRC) \
 	$(ARMV7_SRC) \
 	$(ARM_MISC_SRC) \
+	$(AVR32_SRC) \
 	$(MIPS32_SRC) \
 	avrt.c \
 	dsp563xx.c \
@@ -92,6 +93,12 @@ ARM_DEBUG_SRC = \
 	$(OOCD_TRACE_FILES) \
 	etm_dummy.c
 
+AVR32_SRC = \
+	avr32_ap7k.c \
+	avr32_jtag.c \
+	avr32_mem.c \
+	avr32_regs.c
+
 MIPS32_SRC = \
 	mips32.c \
 	mips_m4k.c \