unbreak sparc64 loader build

re-add accidentally deleted asi value
remove sun4v only header include

Approved by: rwatson (mentor)
Reviewed by: jmg

sys/boot/sparc64/loader/main.c

@@ -35,7 +35,6 @@ __FBSDID("$FreeBSD$");
 #include <machine/metadata.h>
 #include <machine/tte.h>
 #include <machine/upa.h>
-#include <machine/hypervisor_api.h>
 
 #include "bootstrap.h"
 #include "libofw.h"

sys/sparc64/include/asi.h

@@ -123,7 +123,7 @@
 #define	ASI_ITLB_DATA_IN_REG			0x54
 /* US-III Cu: also ASI_ITLB_CAM_ADDRESS_REG */
 #define	ASI_ITLB_DATA_ACCESS_REG		0x55
-
+#define	ASI_ITLB_TAG_READ_REG			0x56
 #define	ASI_IMMU_DEMAP				0x57
 
 #define	ASI_DMMU_TAG_TARGET_REG			0x58