ihk_ikc_recv: Record channel to packet for release

ihk_ikc_release_packet takes the channel and puts the packet into its
free-list.  This fix makes it easy and safe to identify the proper
channel.

Change-Id: I5584b1e8a3ed675c2f9d68f0b5ed331b909197f6
Fujitsu: POSTK_DEBUG_TEMP_FIX_89

kernel/include/syscall.h

@@ -17,6 +17,7 @@
 #include <ihk/atomic.h>
 #include <ihk/context.h>
 #include <ihk/memconst.h>
+#include <ihk/ikc.h>
 #include <rlimit.h>
 #include <time.h>
 
@@ -242,6 +243,7 @@ enum mcctrl_os_cpu_operation {
 };
 
 struct ikc_scd_packet {
+	struct ihk_ikc_packet_header header;
 	int msg;
 	int err;
 	void *reply;
@@ -286,7 +288,7 @@ struct ikc_scd_packet {
 			int *spin_sleep; /* 1: waiting in linux_wait_event() 0: woken up by someone else */
 		} futex;
 	};
-	char padding[8];
+	/* char padding[8]; */ /* We want the size to be 128 bytes */
 };
 
 #define IHK_SCD_REQ_THREAD_SPINNING         0