[PATCH] mx6: Use imx6_src_get_boot_mode() to check boot device

[sbabic at denx.de]

> Use imx6_src_get_boot_mode() instead of manually reading SBMR1.  The
> existing function has proper handling for software overrides of the
> bootdevice which can happen, for example, when booting from an alternate
> source using `bmode`.
> Signed-off-by: Harald Seiler <hws at denx.de>
> Reviewed-by: Fabio Estevam <festevam at gmail.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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