target: consolidate existing target/algo common_magic

Unify common_magic type to unsigned int
Move common_magic to be the first member of the struct
Add unsigned specifier to xxx_COMMON_MAGIC #defines

Change-Id: If961d33232698529514ba3720e04418baf6dc6fe
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: https://review.openocd.org/c/openocd/+/6996
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

src/target/mips64.h

@@ -19,7 +19,7 @@
 #include "register.h"
 #include "mips64_pracc.h"
 
-#define MIPS64_COMMON_MAGIC		0xB640B640
+#define MIPS64_COMMON_MAGIC		0xB640B640U
 
 /* MIPS64 CP0 registers */
 #define MIPS64_C0_INDEX		0
@@ -81,7 +81,8 @@ struct mips64_comparator {
 };
 
 struct mips64_common {
-	uint32_t common_magic;
+	unsigned int common_magic;
+
 	void *arch_info;
 	struct reg_cache *core_cache;
 	struct mips_ejtag ejtag_info;