powerpc: Update MAINTAINERS to point at shared tree

Now that we have a shared powerpc tree on kernel.org, point folks at that
as the primary place to look for powerpc stuff.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Ellerman 2015-07-07 19:16:23 +10:00
commit 9958084a52