powerpc/pseries: Factor HVSI header struct in packet definitions

Embed the struct hvsi_header in the various packet definitions
rather than open coding it multiple times. Will help provide
stronger type checking.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/include/asm/hvsi.h b/arch/powerpc/include/asm/hvsi.h
index f13125a..ab2ddd7 100644
--- a/arch/powerpc/include/asm/hvsi.h
+++ b/arch/powerpc/include/asm/hvsi.h
@@ -29,16 +29,12 @@
 } __attribute__((packed));
 
 struct hvsi_data {
-	uint8_t  type;
-	uint8_t  len;
-	uint16_t seqno;
+	struct hvsi_header hdr;
 	uint8_t  data[HVSI_MAX_OUTGOING_DATA];
 } __attribute__((packed));
 
 struct hvsi_control {
-	uint8_t  type;
-	uint8_t  len;
-	uint16_t seqno;
+	struct hvsi_header hdr;
 	uint16_t verb;
 	/* optional depending on verb: */
 	uint32_t word;
@@ -46,16 +42,12 @@
 } __attribute__((packed));
 
 struct hvsi_query {
-	uint8_t  type;
-	uint8_t  len;
-	uint16_t seqno;
+	struct hvsi_header hdr;
 	uint16_t verb;
 } __attribute__((packed));
 
 struct hvsi_query_response {
-	uint8_t  type;
-	uint8_t  len;
-	uint16_t seqno;
+	struct hvsi_header hdr;
 	uint16_t verb;
 	uint16_t query_seqno;
 	union {