msm: msm_fb: Move to using managed resources of kzalloc

Move to managed verion of kzalloc. Also checks return for failure case
which was missing.

Signed-off-by: Pramod Gurav <pramod.gurav@smartplayin.com>
CC: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
CC: Tomi Valkeinen <tomi.valkeinen@ti.com>
CC: Stephen Boyd <sboyd@codeaurora.org>
CC: Jingoo Han <jg1.han@samsung.com>
CC: Rob Clark <robdclark@gmail.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>