We currently port some materials with concern to card
probling and gendisk recognization, etc. In attempt to
keep best bisecompatibe with upstream, the less legacy works
the better.
Change-Id: Ieb0e609f5cad4e889be6194f8fd8a54057a1174b
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>