procfs: add '/proc/pid/stat' to mckernel side and fix its comm

This lets ps show the proper executable name instead of mcexec's comm
on linux side

Change-Id: I62732037451f129fc2e905357ebdc351bf7f6d2d
Refs: #1114

kernel/syscall.c

@@ -237,6 +237,7 @@ long do_syscall(struct syscall_request *req, int cpu)
 
 	dkprintf("%s: syscall num: %d waiting for Linux.. \n",
 		__FUNCTION__, req->number);
+	proc->forwarding = 1;
 
 #define	STATUS_IN_PROGRESS	0
 #define	STATUS_COMPLETED	1
@@ -398,6 +399,7 @@ long do_syscall(struct syscall_request *req, int cpu)
 			send_syscall(&req2, cpu, &res);
 		}
 	}
+	proc->forwarding = 0;
 	if (req->rtid == -1) {
 		preempt_enable();
 	}