msm: mdss: allocate buffer using mmap call in recovery mode for MSM8909w

smem_start and size should not be initialize as part of cont-splash-memory
blob parsing. It avoids frame buffer allocation during mmap request.

Fix issue by removing smem parameter initialization in mdp3_parse_dt_splash
function.

Change-Id: I54c0871f456390e5f59ef37b240d69b9d213e012
Signed-off-by: Sachin Bhayare <sachin.bhayare@codeaurora.org>