powerpc: Add ppc64le_defconfig

Based directly on ppc64_defconfig using merge_config.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index b9b4af2..3704db4 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -288,6 +288,10 @@
 pseries_le_defconfig:
 	$(call merge_into_defconfig,pseries_defconfig,le)
 
+PHONY += ppc64le_defconfig
+ppc64le_defconfig:
+	$(call merge_into_defconfig,ppc64_defconfig,le)
+
 PHONY += mpc85xx_defconfig
 mpc85xx_defconfig:
 	$(call merge_into_defconfig,mpc85xx_basic_defconfig,\