drm/bridge: lt9611: remove lt9611 reset from pre_enable

lt9611_bridge_pre_enable is not supposed to do lt9611uxc IC's
reset for it will reset the irq status reg and hpd status reg
which may cause many interrupts.

Change-Id: I9bde734c3227adca170208ca642792be64b4a72c
Signed-off-by: GG Hou <renjhou@codeaurora.org>