[PATCH 3/3] spl: Add prototype to function spl_board_boot_device()

[sbabic at denx.de]

> Add prototype to function spl_board_boot_device to fix the following
> sparse warning:
> board/freescale/imx8mm_evk/spl.c:26:5: warning: no previous prototype
> for ‘spl_board_boot_device’ [-Wmissing-prototypes]
> Signed-off-by: Alifer Moraes <alifer.wsdm at gmail.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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