arm64: defconfig: remove duplicate entry

This fixes a warning:
warning: override: reassigning to symbol SPI_MESON_SPIFC
Signed-off-by: NArnd Bergmann <arnd@arndb.de>

arch/arm64/configs/defconfig

@@ -269,7 +269,6 @@ CONFIG_SPI_MESON_SPICC=m
 CONFIG_SPI_MESON_SPIFC=m
 CONFIG_SPI_BCM2835=m
 CONFIG_SPI_BCM2835AUX=m
-CONFIG_SPI_MESON_SPIFC=m
 CONFIG_SPI_ORION=y
 CONFIG_SPI_PL022=y
 CONFIG_SPI_QUP=y