powerpc/8xx: fix invalid register expression in head_8xx.S

[Michael Ellerman]

On Thu, 2018-05-24 at 11:02:06 UTC, Christophe Leroy wrote:
> New binutils generate the following warning
> 
>   AS      arch/powerpc/kernel/head_8xx.o
> arch/powerpc/kernel/head_8xx.S: Assembler messages:
> arch/powerpc/kernel/head_8xx.S:916: Warning: invalid register expression
> 
> This patch fixes it.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy at c-s.fr>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/e4ccb1dae6bdef228d729c076c3816

cheers