Fix errors caught by aapt2

Fixes:
frameworks/base/tests/LotsOfApps/AndroidManifest.xml:10: error: attribute 'android:name' in <activity> tag must be a valid Java class name.
frameworks/base/tests/LotsOfApps/AndroidManifest.xml:17: error: attribute 'android:name' in <activity> tag must be a valid Java class name.
frameworks/base/tests/LotsOfApps/AndroidManifest.xml:24: error: attribute 'android:name' in <activity> tag must be a valid Java class name.
...

Bug: 79481102
Test: m java FORCE_AAPT2=true
Change-Id: Ib00f277d251497942ad53f1ba1f8f5e12b2f7ba9