PS3: Fix build with 32-bit toolchains

[Geoff Levand <geoffrey.levand@am.sony.com>]

The PS3 bootwrapper files use instructions only available on
64-bit CPUs.  Add the code generation directive '.machine "ppc64"'
for toolchains configured for 32-bit CPUs.

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
---
Paul,

Please apply for 2.6.23-rc1.

 arch/powerpc/boot/ps3-head.S   |    2 ++
 arch/powerpc/boot/ps3-hvcall.S |    2 ++
 2 files changed, 4 insertions(+)

--- a/arch/powerpc/boot/ps3-head.S
+++ b/arch/powerpc/boot/ps3-head.S
@@ -20,6 +20,8 @@
 
 #include "ppc_asm.h"
 
+	.machine "ppc64"
+
 	.text
 
 /*
--- a/arch/powerpc/boot/ps3-hvcall.S
+++ b/arch/powerpc/boot/ps3-hvcall.S
@@ -20,6 +20,8 @@
 
 #include "ppc_asm.h"
 
+	.machine "ppc64"
+
 /*
  * The PS3 hypervisor uses a 64 bit "C" language calling convention.
  * The routines here marshal arguments between the 32 bit wrapper