[PATCH] imx8mm_evk: Include sys_proto.h header

[sbabic at denx.de]

> Add sys_proto.h header file to fix the following sparse warning:
> board/freescale/imx8mm_evk/imx8mm_evk.c:59:5: warning: no previous
> prototype for ‘board_mmc_get_env_dev’ [-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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