drm/msm: ignore HS TX timeout when bllp_lp11 is disabled

When bllp_lp11 is disabled, HW is configured to stay in HS in the entire
frame and always trigger HS TX timeout. This change will disable the
interrupt and error handling for this special configuration.

Change-Id: I0e5fdf28c7d878c5d431d56e7928bb0b947a75e7
Signed-off-by: Xiaowen Wu <wxiaowen@codeaurora.org>