imx: imx6: Add comment to gpr_init function
This function can be used only for some of the nxp SoC. Make it explicit in the comment. This adjust a bit commit 3aa4b703 ("imx: imx6: Move gpr_init() function to soc.c") Signed-off-by: NMichael Trimarchi <michael@amarulasolutions.com> Acked-by: NJagan Teki <jagan@amarulasolutions.com>
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