linux-yocto/4.1: braswell bug fixes
Updating the 4.1 SRCREVs to integrate the following DRM backports:
a8abc111a96d drm/i915: Only wait for required lanes in vlv_wait_port_ready()
81354180432b Revert "drm/i915: Hack to tie both common lanes together on chv"
d660fc117731 drm/i915: Work around DISPLAY_PHY_CONTROL register corruption on CHV
0e797e9cb717 drm/i915: Implement chv display PHY lane stagger setup
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
