msm: mdss: call MDSS_XLOG_TOUT_HANDLER at thread context

MDSS_XLOG_TOUT_HANDLER() is for debug purpose. It acquires
a mutex and thus should not be called from an interrupt
context. Move this call to a thread context instead.

CRs-Fixed: 692386
Change-Id: I631ffa4c972b66991eb65ad0de294378e0d3f266
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>