aarch64: introduce dpm extension for ARMv8

Add or move ARMv8 related dpm function to their own source module

Change-Id: Id93d50be0b8635bd40ddb2a74fe8746ff840d736
Signed-off-by: Matthias Welwarsky <matthias.welwarsky@sysgo.com>

src/target/arm_dpm.h

@@ -59,7 +59,7 @@ struct arm_dpm {
 	struct arm *arm;
 
 	/** Cache of DIDR */
-	uint32_t didr;
+	uint64_t didr;
 
 	/** Invoke before a series of instruction operations */
 	int (*prepare)(struct arm_dpm *);
@@ -67,6 +67,9 @@ struct arm_dpm {
 	/** Invoke after a series of instruction operations */
 	int (*finish)(struct arm_dpm *);
 
+	/** Runs one instruction. */
+	int (*instr_execute)(struct arm_dpm *, uint32_t opcode);
+
 	/* WRITE TO CPU */
 
 	/** Runs one instruction, writing data to DCC before execution. */