configs: Move CONFIG_SPI_FLASH into defconfigs

Completely move CONFIG_SPI_FLASH from remaining board header files to
defconfigs

Signed-off-by: Vignesh R <vigneshr@ti.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
Tested-by: Jagan Teki <jagan@amarulasolutions.com> #zynq-microzed
diff --git a/configs/evb-rk3128_defconfig b/configs/evb-rk3128_defconfig
index 78c5ac6..d2c0fb0 100644
--- a/configs/evb-rk3128_defconfig
+++ b/configs/evb-rk3128_defconfig
@@ -29,6 +29,7 @@
 CONFIG_SYS_I2C_ROCKCHIP=y
 CONFIG_MMC_DW=y
 CONFIG_MMC_DW_ROCKCHIP=y
+CONFIG_SPI_FLASH=y
 CONFIG_PHY=y
 CONFIG_PINCTRL=y
 CONFIG_REGULATOR_PWM=y