arm64: defconfig: enable NXP FlexSPI driver

Enable driver support of NXP FlexSPI controller.
Signed-off-by: Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/configs/defconfig

@@ -370,6 +370,7 @@ CONFIG_SPI_ROCKCHIP=y
 CONFIG_SPI_QUP=y
 CONFIG_SPI_S3C64XX=y
 CONFIG_SPI_SPIDEV=m
+CONFIG_SPI_NXP_FLEXSPI=y
 CONFIG_SPMI=y
 CONFIG_PINCTRL_SINGLE=y
 CONFIG_PINCTRL_MAX77620=y