ARM: uniphier: rename CONFIG_MACH_* to CONFIG_ARCH_UNIPHIER_*

I want these prefixed with CONFIG_ARCH_UNIPHIER_ to clarify
they belong to UniPhier SoC family.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/configs/ph1_sld8_defconfig b/configs/ph1_sld8_defconfig
index 216d49b..00917fb 100644
--- a/configs/ph1_sld8_defconfig
+++ b/configs/ph1_sld8_defconfig
@@ -1,7 +1,7 @@
 CONFIG_ARM=y
 CONFIG_ARCH_UNIPHIER=y
 CONFIG_SYS_MALLOC_F_LEN=0x2000
-CONFIG_MACH_PH1_SLD8=y
+CONFIG_ARCH_UNIPHIER_PH1_SLD8=y
 CONFIG_MICRO_SUPPORT_CARD=y
 CONFIG_SYS_TEXT_BASE=0x84000000
 CONFIG_DEFAULT_DEVICE_TREE="uniphier-ph1-sld8-ref"