drm: Separate EDID Header Check from EDID Block Check

    Provides function drm_edid_header_is_valid() for EDID header check
    and replaces EDID header check part of function drm_edid_block_valid()
    by a call of drm_edid_header_is_valid().
    This is a prerequisite to extend DDC probing, e. g. in function
    radeon_ddc_probe() for Radeon devices, by a central EDID header check.

    Tested for kernel 2.6.35, 2.6.38 and 3.0

Cc: <[email protected]>
Signed-off-by: Thomas Reim <[email protected]>
Reviewed-by: Alex Deucher <[email protected]>
Acked-by: Stephen Michaels <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>

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