Module `modem_svc_sit` is not valid unless:
* USES_LASSEN_MODEM is true
* BOARD_WITHOUT_RADIO is NOT true (or NOT set)
Devices in gs201 family will set "USES_LASSEN_MODEM := true"; however,
not evevy gs201 device disables BOARD_WITHOUT_RADIO.
This commit defines PRODUCT_PACKAGES `modem_svc_sit` because it is
converted from bp by moving the if-statement constrain from the module
level to device level, device-lynx.mk in this case.
Flag: EXEMPT refactor
Bug: 358485346
Test: m modem_svc_sit
Change-Id: Idd5dba13db6ee259df507d94ce7a83d5b27af29c