ARM: uniphier: move CONFIG_NAND to defconfig

This imply was added when the option was moved by the moveconfig tool,
but the intention is not clear.  Move it to defconfig.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>

arch/arm/mach-uniphier/Kconfig

@@ -9,7 +9,6 @@ config ARCH_UNIPHIER_32BIT
 	select CPU_V7_HAS_NONSEC
 	select ARMV7_NONSEC
 	select ARCH_SUPPORT_PSCI
-	imply NAND
 
 choice
         prompt "UniPhier SoC select"

configs/uniphier_ld4_sld8_defconfig

@@ -36,6 +36,7 @@ CONFIG_GPIO_UNIPHIER=y
 CONFIG_MISC=y
 CONFIG_I2C_EEPROM=y
 CONFIG_MMC_UNIPHIER=y
+CONFIG_NAND=y
 CONFIG_NAND_DENALI=y
 CONFIG_NAND_DENALI_DT=y
 CONFIG_SYS_NAND_DENALI_64BIT=y

configs/uniphier_pro4_defconfig

@@ -35,6 +35,7 @@ CONFIG_GPIO_UNIPHIER=y
 CONFIG_MISC=y
 CONFIG_I2C_EEPROM=y
 CONFIG_MMC_UNIPHIER=y
+CONFIG_NAND=y
 CONFIG_NAND_DENALI=y
 CONFIG_NAND_DENALI_DT=y
 CONFIG_SYS_NAND_DENALI_64BIT=y

configs/uniphier_pxs2_ld6b_defconfig

@@ -36,6 +36,7 @@ CONFIG_GPIO_UNIPHIER=y
 CONFIG_MISC=y
 CONFIG_I2C_EEPROM=y
 CONFIG_MMC_UNIPHIER=y
+CONFIG_NAND=y
 CONFIG_NAND_DENALI=y
 CONFIG_NAND_DENALI_DT=y
 CONFIG_SYS_NAND_DENALI_64BIT=y