drm/hibmc: Do not use cpp from struct drm_format_info

Replace uses of struct drm_format_info's cpp with appropriate interfaces.
The cpp field contains the characters per pixel. It is deprecated and
should be avoided.

Calculate the line width in bytes with drm_format_info_min_pitch(). This
is the preferred way of getting pixel and line sizes.

Program HIB_CRT_DISP_CTL_FORMAT from the format's 4CC code instead of
calculating the field's value from the cpp.

v4:
- introduce fb variable in separate patch (Yongbang)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Yongbang Shi <shiyongbang@huawei.com>
Link: https://patch.msgid.link/20260618123142.92298-5-tzimmermann@suse.de

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