ARM: UniPhier: add Kconfig and defconfig

This commit allows to build Panasonic UniPhier family:
PH1-LD4, PH1-Pro4, PH1-sLD8

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/configs/ph1_pro4_defconfig b/configs/ph1_pro4_defconfig
new file mode 100644
index 0000000..209466e
--- /dev/null
+++ b/configs/ph1_pro4_defconfig
@@ -0,0 +1,8 @@
+CONFIG_SPL=y
++S:CONFIG_ARM=y
++S:CONFIG_ARCH_UNIPHIER=y
++S:CONFIG_MACH_PH1_PRO4=y
+CONFIG_NAND_DENALI=y
+CONFIG_SYS_NAND_DENALI_64BIT=y
+CONFIG_NAND_DENALI_SPARE_AREA_SKIP_BYTES=8
+S:CONFIG_SPL_NAND_DENALI=y