Support SMS/WAP initiated SUPL

Support SMS/WAP NI SUPL message injection, this feature can be
enabled by setting ENABLE_NI_SUPL_MESSAGE_INJECTION=true
in gps.conf.

Test: 1. Set ENABLE_NI_SUPL_MESSAGE_INJECTION to true in gps_debug.conf
      2. Enable NFW lock
      3. atest SmsNiSuplTest
      4. Confirm the SUPL message is injected to HAL
Bug: 242105192

Change-Id: I97c59cd2d1e6e7d698cca458cf18bc2666608bf8