Fix compiler/assembler flags for Ebony platform boot files

[Dave Jiang]

Josh Boyer wrote:
> On Fri, 2007-05-25 at 13:19 +1000, David Gibson wrote:
>> The recent addition of assembler flags for 44x.c and ebony.c in the
>> bootwrapper to make them compile on certain toolchains was not correct
>> and could break other platforms.  This patch switches to using a
>> compiler flag instead, which implies the appropriate assembler flag,
>> and also stops the compiler itself generating instructions which are
>> invalid for the platform in question.
> 
> This looks good to me, but I don't have one of the failing toolchains.
> Dave, can you test this patch out?
> 
> josh
> 

Built ok for me after the patch.