powerpc: Add more Power7 specific definitions

This adds more SPR definitions used on newer processors when running
in hypervisor mode. Along with some other P7 specific bits and pieces

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h
index 9821006..1b42238 100644
--- a/arch/powerpc/include/asm/ppc_asm.h
+++ b/arch/powerpc/include/asm/ppc_asm.h
@@ -170,6 +170,7 @@
 #define HMT_MEDIUM	or	2,2,2
 #define HMT_MEDIUM_HIGH or	5,5,5		# medium high priority
 #define HMT_HIGH	or	3,3,3
+#define HMT_EXTRA_HIGH	or	7,7,7		# power7 only
 
 #ifdef __KERNEL__
 #ifdef CONFIG_PPC64