SecureElementService may be unavailable when NfcService is started

Currently NfcService attempts to get an interface to
SecureElementService only in its constructor, so there is no chance to
do it later again if it fails. Introducing a lazy initialization
mechanism is required.

Bug: 110121800
Test: Confirmed that NfcService gets SEService even if it failed once.

Change-Id: I2b3c873d7661cde63af8c9f8c05945c3568f012f