[U-Boot] [RESEND PATCH] arm: imx6: cm_fx6: Enable DM SPI and SPI_FLASH, fix SPL build errors

[sbabic at denx.de]

> From: Suniel Mahesh <sunil.m at techveda.org>
> Enable driver model for SPI and SPI_FLASH to remove the following
> compile warning on CM-FX6 SOM:
> ===================== WARNING ======================
> This board does not use CONFIG_DM_SPI_FLASH. Please update
> the board to use CONFIG_SPI_FLASH before the v2019.07 release.
> ====================================================
> This change introduced SPL build error as shown:
> In file included from include/common.h:47:0,
>                  from drivers/mtd/spi/sf_probe.c:10:
> drivers/mtd/spi/sf_probe.c: In function 'spi_flash_std_probe':
> drivers/mtd/spi/sf_probe.c:149:54: error: dereferencing pointer to incomplete type 'struct dm_spi_slave_platdata'
> scripts/Makefile.build:278: recipe for target 'spl/drivers/mtd/spi/sf_probe.o' failed
> make[3]: *** [spl/drivers/mtd/spi/sf_probe.o] Error 1
> scripts/Makefile.build:432: recipe for target 'spl/drivers/mtd/spi' failed
> make[2]: *** [spl/drivers/mtd/spi] Error 2
> Disabling DM for SPI support(SPI and SF) in SPL resolves the issue.
> Target was compile tested, build was clean.
> Signed-off-by: Suniel Mahesh <sunil.m at techveda.org>
Applied to u-boot-imx, -next, thanks !

Best regards,
Stefano Babic

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