target/adiv5: Large Physical Address Extension

Provides ARM LPAE support to allow 64-bit TAR setting
on MEM AP accesses.

Tested on a 4-core ARM ARES Processor system using an
AXI Access Port.

Change-Id: I88f7a0a57a6abb58665032929194a41dd8729f6b
Signed-off-by: Kevin Burke <kevinb@os.amperecomputing.com>
Signed-off-by: Daniel Goehring <dgoehrin@os.amperecomputing.com>
Reviewed-on: http://openocd.zylin.com/5576
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

src/target/armv7a.h

@@ -104,7 +104,7 @@ struct armv7a_common {
 
 	/* Core Debug Unit */
 	struct arm_dpm dpm;
-	uint32_t debug_base;
+	target_addr_t debug_base;
 	struct adiv5_ap *debug_ap;
 	/* mdir */
 	uint8_t multi_processor_system;