hwcomposer: fix the bug in setting connected status to  ext display

the hdmi driver can send change uevent anytime, in which case, the
connected state was getting set to 0, due to its default value.

Change-Id: I862a120a6f36eb788f1e28d0f0650d924ff4f83a
Acked-by: Arun Kumar K.R <akumarkr@codeaurora.org>
1 file changed