ARM: display5: Fix CS check after moving some SPI related CONFIGs to Kconfig

After commit 14453fbf ("Convert CONFIG_SF_DEFAULT_* to Kconfig")
and commit abe66b1b ("Convert CONFIG_ENV_SPI_* to Kconfig") ,which
moved some SPI related CONFIG_* defines to Kconfig the display5 board has
become unbootable as the SPI CS check condition had wrong value.

This commit fixes this check and allows proper SPI NOR flash operation in
SPL.

Signed-off-by: Lukasz Majewski <lukma@denx.de>