[U-Boot] ARM: imx: fix: Provide correct enum values for ONENAND/NOR boot recognition

[sbabic at denx.de]

> According to "Table 5-1. Boot Device Select" (page 335,
> i.MX 6Dual/6Quad Applications Processor Reference Manual, Rev. 4, 09/2017)
> the BOOT_CFG1[3] have following values (regarding EIM booting):
> 0 - NOR flash and 1 - ONENAND
> This commit provides correct identification of the boot medium for IMX6Q
> boards booting from NOR memory (MCCMON6 is one of them).
> Signed-off-by: Lukasz Majewski <lukma at denx.de>

Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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