Sending SMS via 1.6 APIs in VTS 1.6

Bug: 195097899
Test: atest VtsHalRadioV1_6TargetTest -- --test-arg com.android.tradefed.testtype.GTest:native-test-flag:"--gtest_filter=*send*/0_slot1"

Ignore-AOSP-First: cherry-pick from AOSP
Change-Id: I19ead8a4e1ab2f1e4ddb3f55edacd4b51990f9cd
Merged-In: I19ead8a4e1ab2f1e4ddb3f55edacd4b51990f9cd