powerpc/Makefile: Construct the UTS_MACHINE value more concisely

Use the standard Kbuild trick of foo-y to make the construction of
UTC_MACHINE less verbose.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Ellerman 2016-08-11 16:03:15 +10:00
commit 57073e2781