SQLiteWrapper cleanup, removed unused checks.

Removed requery as it was unused, removed out-of-date
memory checks. All functionalities stay the same.
This change was initially made to prevent hidden APIs
usage in the library.

Tag: #feature
Bug: 190441152
Test: atest android.telephony.cts.MmsTest
NoNonSdkCheck: API usage is inside the class and removed with CL
Change-Id: I7498b0cd9e9955158094348acc2c94e0b2552b0d