powerpc: Add CONFIG_VSX config option

Add CONFIG_VSX config build option.  Must compile with POWER4, FPU and ALTIVEC.
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/Kconfig.cputype

@@ -160,6 +160,22 @@ config ALTIVEC
 
 	  If in doubt, say Y here.
 
+config VSX
+	bool "VSX Support"
+	depends on POWER4 && ALTIVEC && PPC_FPU
+	---help---
+
+	  This option enables kernel support for the Vector Scaler extensions
+	  to the PowerPC processor. The kernel currently supports saving and
+	  restoring VSX registers, and turning on the 'VSX enable' bit so user
+	  processes can execute VSX instructions.
+
+	  This option is only useful if you have a processor that supports
+	  VSX (P7 and above), but does not have any affect on a non-VSX
+	  CPUs (it does, however add code to the kernel).
+
+	  If in doubt, say Y here.
+
 config SPE
 	bool "SPE Support"
 	depends on E200 || (E500 && !PPC_E500MC)