target: msm8996: add special pipe update feature

Except frame buffer's address changing, LK's frame flip
setting will not change after it's enabled, so it's not
needed to do reconfiguration for every frame, just updating
pipe related registers is enough. This feature can support
bootloader and kernel update hardware at the same time.

CRs-Fixed: 2224864
Change-Id: I0f6516b021df2260b42fb2219649281167bd8e83
Signed-off-by: Guchun Chen <guchunc@codeaurora.org>
Signed-off-by: Xiaowen Wu <wxiaowen@codeaurora.org>