Telephony: remove setCurrentPreferredNetworkType done on SIM ready

Upon SIM ready, RIL_REQUEST_SET_PREFERRED_NETWORK_TYPE
is sent to make sure the network type is set for modem
which does not restore the type. setPreferredNetworkType
is already issued upon RIL_UNSOL_RIL_CONNECTED message.
Doing it again in SIM ready is redundant.

Also setting preferred network type on SIM ready,
will result in emergency call being dropped if the
user unlocks the phone when the emergency call is connected.

This patch removes the setCurrentPreferredNetworkType done
on SIM ready.

Change-Id: I33a79d85096fcaae9e58e5c165bac9ed2db7bc8c
Author: Jeevaka Badrappan <jeevaka.badrappan@intel.com>
Signed-off-by: Jeevaka Badrappan <jeevaka.badrappan@intel.com>
Signed-off-by: Arun Ravindran <arun.ravindran@intel.com>
Signed-off-by: Shuo Gao <shuo.gao@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 45846