SF: Use vsync workaround to detect hotplug errors

HWC sets a system property,
debug.sf.hwc_hotplug_error_via_neg_vsync, to inform SF that
it should check negative vsync, parse and propagate any error
code on hotplug event up the stack.

Bug: 241286153
Test: manual
Change-Id: I32214378b00a1b002fa144dbef3f6610818a053a