msm_serial_hs_lite: Changes for enable/disable console

usage:
To disable console:
echo 0 > /sys/devices/platform/msm_serial_hsl.0/console

To enable console:
echo 1 > /sys/devices/platform/msm_serial_hsl.0/console

To see the status of console:
cat /sys/devices/platform/msm_serial_hsl.0/console

Change-Id: I3fe188cd18429641de8e48075f37a1729a36d80b
Signed-off-by: Mayank Rana <mrana@codeaurora.org>