[PATCH] imx: ahab: fix implicit declaration warning

[sbabic at denx.de]

> Fix the following warning:
> arch/arm/mach-imx/imx8/ahab.c:105:3: warning: implicit declaration of function ‘flush_dcache_range’ [-Wimplicit-function-declaration]
>    flush_dcache_range(s, e);
>    ^~~~~~~~~~~~~~~~~~
> Include cpu_func.h header which declares the flush_dcache_range()
> function.
> Signed-off-by: Oliver Graute <oliver.graute at kococonnector.com>
> Cc: Stefano Babic <sbabic at denx.de>
> Cc: uboot-imx <uboot-imx at nxp.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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