ARM: dts: msm: remove non-removable property for SD card

On 8916 SKUI, the SD card still be removed even though
it doesn't have a card-detect gpio pin. Hence, removed
the non-removeable property so as to enable polling.

Change-Id: I68b8c486ab85578e8e408a55bb7e5f14b2944592
Signed-off-by: Guoping Yu <guopingy@codeaurora.org>