[PATCH] doc: sl-mx8mm: Fix mistake in merge conflict resolution

[sbabic at denx.de]

> From: Frieder Schrempf <frieder.schrempf at kontron.de>
> There was a conflict between the following two commits, that wasn't
> resolved correctly. Fix this.
> a93985ddfcc3 ("doc: sl-mx8mm: Update the NXP TF-A source reference")
> f0f461287eff ("imx: Suggest the NXP ATF github repo")
> Signed-off-by: Frieder Schrempf <frieder.schrempf at kontron.de>
> Cc: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
> Cc: Fabio Estevam <festevam at denx.de>
> Cc: Stefano Babic <sbabic at denx.de>
> Reviewed-by: Fabio Estevam <festevam at denx.de>
Applied to u-boot-imx, next, thanks !

Best regards,
Stefano Babic

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