In some cases, the user program can disable the cursor,
for example, Qt4 library do this, so the cursor remains invisible
after the restart.
The patch adds a command to activate the cursor,
by sending DECTECM command to the terminal.
Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>