ARM: uniphier: merge ph1_ld4_defconfig and ph1_sld8_defconfig

These two are similar enough to be merged into a single
defconfig file.  Distinguish one from another by "DEVICE_TREE"
from the command line.  The how-to-build in doc/README.uniphier
should be also updated.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 394be1e..18d8fce 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -162,6 +162,7 @@
 T:	git git://git.denx.de/u-boot-uniphier.git
 F:	arch/arm/mach-uniphier/
 F:	configs/ph1_*_defconfig
+F:	configs/uniphier_*_defconfig
 N:	uniphier
 
 ARM ZYNQ