ARM: uniphier: drop PH1- prefix from CONFIG options and file names

The current CONFIG names like "CONFIG_ARCH_UNIPHIER_PH1_PRO4" is too
long.  It would not hurt to drop "PH1_" because "UNIPHIER_" already
well specifies the SoC family.  Also, rename files for consistency.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/configs/uniphier_sld3_defconfig b/configs/uniphier_sld3_defconfig
index 5f0d678..f779ded 100644
--- a/configs/uniphier_sld3_defconfig
+++ b/configs/uniphier_sld3_defconfig
@@ -1,6 +1,6 @@
 CONFIG_ARM=y
 CONFIG_ARCH_UNIPHIER=y
-CONFIG_ARCH_UNIPHIER_PH1_SLD3=y
+CONFIG_ARCH_UNIPHIER_SLD3=y
 CONFIG_MICRO_SUPPORT_CARD=y
 CONFIG_SYS_TEXT_BASE=0x84000000
 CONFIG_DEFAULT_DEVICE_TREE="uniphier-ph1-sld3-ref"