ARM: uniphier: enable CONFIG_SYS_NO_FLASH if no CONFIG_MICRO_SUPPORT_CARD

NOR flash devices are seldom used on UniPhier platforms these days.
The only use case I see is the Micro Support Card is connected.
Otherwise, define CONFIG_SYS_NO_FLASH to disable NOR FLASH.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>