msm_fb: display: cleanup overlay0 writeback funcs and config flags
The writeback blt mode is controlled by assignment of blt_base (NULL
or not), only the #ifdef in board file is effective. Those flags and
funcs on the driver side is cleaned up.
Change-Id: Idc9a7fbb5525071bf3cf68e5182bc7f6a5693932
Signed-off-by:
Huaibin Yang <huaibiny@codeaurora.org>
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