ARM: dh_imx6: enable GigaDevice, Macronix, and Winbond SPI Flash support in Kconfig

In preparation for delivery bottlenecks, enable support for GigaDevice, Macronix, and Winbond nor flash chips.

Signed-off-by: Ludwig Zenz <lzenz@dh-electronics.de>

configs/dh_imx6_defconfig

@@ -39,7 +39,10 @@ CONFIG_BOOTCOUNT_LIMIT=y
 CONFIG_SYS_BOOTCOUNT_ADDR=0x00900000
 CONFIG_FSL_ESDHC=y
 CONFIG_SPI_FLASH=y
+CONFIG_SPI_FLASH_GIGADEVICE=y
+CONFIG_SPI_FLASH_MACRONIX=y
 CONFIG_SPI_FLASH_SPANSION=y
+CONFIG_SPI_FLASH_WINBOND=y
 CONFIG_PHYLIB=y
 CONFIG_PHY_MICREL=y
 CONFIG_PHY_MICREL_KSZ90X1=y