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

This reverts commit b70d470e20.

That commit had been landed too fast after a mistake during migration
from old to new gerrit that didn't keep -1 vote ; it needs some fix

Change-Id: Ifc8a23e42449dfe471049270b4706e9b137e096e

kernel/include/process.h

@@ -522,10 +522,9 @@ struct process {
 	int egid;
 	int sgid;
 	int fsgid;
-	int execed:1;
-	int nohost:1;
-	int nowait:1;
-	int forwarding:1;
+	int execed;
+	int nohost;
+	int nowait;
 	struct rlimit rlimit[MCK_RLIM_MAX];
 	unsigned long saved_auxv[AUXV_LEN];
 	char *saved_cmdline;