powerpc: Add DAWR CPU feature bit definition

.. and add it to POWER8 cpu features.
Signed-off-by: NMichael Neuling <mikey@neuling.org>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/include/asm/cputable.h

@@ -174,6 +174,7 @@ extern const char *powerpc_base_platform;
 #define CPU_FTR_TM			LONG_ASM_CONST(0x0080000000000000)
 #define CPU_FTR_BCTAR			LONG_ASM_CONST(0x0100000000000000)
 #define	CPU_FTR_HAS_PPR			LONG_ASM_CONST(0x0200000000000000)
+#define CPU_FTR_DAWR			LONG_ASM_CONST(0x0400000000000000)
 
 #ifndef __ASSEMBLY__
 
@@ -413,7 +414,7 @@ extern const char *powerpc_base_platform;
 	    CPU_FTR_DSCR | CPU_FTR_SAO  | \
 	    CPU_FTR_STCX_CHECKS_ADDRESS | CPU_FTR_POPCNTB | CPU_FTR_POPCNTD | \
 	    CPU_FTR_ICSWX | CPU_FTR_CFAR | CPU_FTR_HVMODE | CPU_FTR_VMX_COPY | \
-	    CPU_FTR_DBELL | CPU_FTR_HAS_PPR)
+	    CPU_FTR_DBELL | CPU_FTR_HAS_PPR | CPU_FTR_DAWR)
 #define CPU_FTRS_CELL	(CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
 	    CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \
 	    CPU_FTR_ALTIVEC_COMP | CPU_FTR_MMCRA | CPU_FTR_SMT | \