uboot-imx

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>