argo: fixup argo_dprintk()

Current argo_dprintk() implementation is a wrapper around raw printk().

Rewire it through gprintk() to allow for better debugging context
(such as domain ID).

Signed-off-by: Denis Mukhin <dmukhin@ford.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Reviewed-by: Jason Andryuk <jason.andryuk@amd.com>
Reviewed-by: Daniel P. Smith <dpsmith@apertussolutions.com>

xen/common/argo.c

@@ -322,7 +322,7 @@ static DEFINE_RWLOCK(L1_global_argo_rwlock); /* L1 */
 #define argo_dprintk(fmt, args...)                      \
     do {                                                \
         if ( ARGO_DEBUG )                               \
-            printk(XENLOG_DEBUG "argo: " fmt, ##args);  \
+            gprintk(XENLOG_DEBUG, "argo: " fmt, ##args);\
     } while ( 0 )
 
 /*