[PATCH] env: add prototypes for weak function

[Wolfgang Denk]

Dear Patrick,

In message <20200124124142.392-1-patrick.delaunay at st.com> you wrote:
>
> +/* allows to set ext4 interface */
> +const char *env_ext4_get_intf(void);

Are you sure these comments are correct?

A "get interface" function is not supposed to set anything?

> +/* allows to set ext4 device and partition */
> +const char *env_ext4_get_dev_part(void);

A "get device and partition" function is not supposed to set anything?

Best regards,

Wolfgang Denk

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