mmc: core: add long read time fixup for certain Samsung eMMC

Certain Samsung eMMC meet multi read timeout, and could not
reponse status CMD anymore after that. Add long read timeout
fixup to resolve it.

Change-Id: Ibeb0e6ab3d889d48fdee91244bec720a6994b907
Signed-off-by: Guoping Yu <guopingy@codeaurora.org>