armv7a: ARMv7-A MMU tools

factor out mmu-related code from armv7a.c, add a 'dump' command for
page tables.

Change-Id: Ic1ac3c645d7fd097e9d625c7c8302e7065875dd4
Signed-off-by: Matthias Welwarsky <matthias.welwarsky@sysgo.com>
Reviewed-on: http://openocd.zylin.com/4327
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>

src/target/Makefile.am

@@ -75,6 +75,7 @@ ARMV7_SRC = \
 	%D%/armv7m_trace.c \
 	%D%/cortex_m.c \
 	%D%/armv7a.c \
+	%D%/armv7a_mmu.c \
 	%D%/cortex_a.c \
 	%D%/ls1_sap.c \
 	%D%/mem_ap.c
@@ -152,6 +153,7 @@ ESIRISC_SRC = \
 	%D%/arm_adi_v5.h \
 	%D%/armv7a_cache.h \
 	%D%/armv7a_cache_l2x.h \
+	%D%/armv7a_mmu.h \
 	%D%/arm_disassembler.h \
 	%D%/arm_opcodes.h \
 	%D%/arm_simulator.h \