ppc64: Fix clobber list item for JUMP_TO_RESTORER_BLOB

The JUMP_TO_RESTORER_BLOB assembly macro has been rewrote through the
commit '89d6b39c ppc64: pie -- Add ppc64le relocation's
processing', but the Clobber list hasn't been updated.

This doesn't generate build neither runtime errors since the Clobber
list was larger than needed but GCC 7 is now raising an error when an
assembly macro is clobbering the r2 register.

This patch fix the Clobber list to just modified registers.

Fixes: 89d6b39c ("ppc64: pie -- Add ppc64le relocation's processing")
Reported-by: Adrian Reber <adrian@lisas.de>
Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/arch/ppc64/include/asm/restore.h

@@ -21,7 +21,7 @@
 		: "r"(new_sp),						\
 		  "r"((unsigned long)restore_task_exec_start),		\
 		  "r"(task_args)					\
-		: "r1", "1", "2", "3", "12", "memory")
+		: "1", "3", "12")
 
 /* There is nothing to do since TLS is accessed through r13 */
 #define core_get_tls(pcore, ptls)