lockPixels is no longer virtual

See skbug.com/6481

With pixelrefs now always (logically) locked, we no longer override
onNewLockPixels/onUnlockPixels. We also must now pass our
address/rowBytes to the base constructor.

These changes allow us to remove duplicate fields in the hwui Bitmap
subclass -- mRowBytes and mColorTable, since these fields are now always
available from the base-class.

However, since this subclass still wants to overwrite const fields in
the base-class (its reconfigure api), change the impl to use the newly
added private method (android_only_reset) to encapsulate this.

Test: hwui_unit_tests and CtsGraphicsTestCases pass

Change-Id: I57a3af1135580513b708f35549a6defb7ac6c04e