Compare name length to avoid false positives in media_get_entity_by_name

If two subdevice have names that only differ by a suffix (such as "OMAP4
ISS ISP IPIPE" and "OMAP4 ISS ISP IPIPEIF") the media_get_entity_by_name
function might return a pointer to the entity with the longest name when
called with the shortest name. Fix this by verifying that the candidate
entity name length is equal to the requested name length.

Signed-off-by: Sergio Aguirre <saaguirre@ti.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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