Migrate to Android Testing Support Lib (part 3/N)

This CL converts the following 3 test cases to Android Testing Support
Library.
 * MoreKeysKeyboardBuilderAutoOrderTests
 * MoreKeysKeyboardBuilderFixedOrderTests
 * MoreKeysKeyboardBuilderMaxOrderTests

Bug: 110805255
Test: atest LatinIMETests:com.android.inputmethod.keyboard.MoreKeysKeyboardBuilderAutoOrderTests
Test: atest LatinIMETests:com.android.inputmethod.keyboard.MoreKeysKeyboardBuilderFixedOrderTests
Test: atest LatinIMETests:com.android.inputmethod.keyboard.MoreKeysKeyboardBuilderMaxOrderTests
Change-Id: I68d6c1901d4bb77bdc59d0be71eb565984fbd97d