ARM: UniPhier: move pin_init() to board_early_init_f()

Currently, I/O pin settings are not necessary for SPL.
The board_early_init_f() seems a suitable place to call pin_init().

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/include/configs/uniphier.h b/include/configs/uniphier.h
index 35bea1a..15cb223 100644
--- a/include/configs/uniphier.h
+++ b/include/configs/uniphier.h
@@ -95,6 +95,7 @@
 
 #define CONFIG_DISPLAY_CPUINFO
 #define CONFIG_DISPLAY_BOARDINFO
+#define CONFIG_BOARD_EARLY_INIT_F
 #define CONFIG_BOARD_EARLY_INIT_R
 #define CONFIG_BOARD_LATE_INIT