powerpc: Ignore zImage.epapr

This is another file we can generate so add it to the list.
Signed-off-by: NMark Brown <broonie@linaro.org>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/boot/.gitignore

@@ -22,6 +22,7 @@ zImage.initrd
 zImage.bin.*
 zImage.chrp
 zImage.coff
+zImage.epapr
 zImage.holly
 zImage.*lds
 zImage.miboot