Convert SimpleCamera/Android.mk to Android.bp

1. Converted the SimpleCamera/Android.mk to Android.bp;
2. Converted the tests/Android.mk as well;
3. No renderscript files are found in the srcs.

Bug: 124261647
Test: compared the two apk files built by Make and Soong
Test: m SmartCamera
Test: m SmartCamera-tests
Test: TreeHugger
Change-Id: I324c1c744b5a7f836a32fe8409ab8abf19eeeae9