Support Color and ColorSpace on Ravenwood

- Moved Color's JNI methods out of Shader.cpp, so Ravenwood
    can enable it without enabling other shader native methods.

- Also, leaned up the Matrix native methods while I'm here.

Bug: 337110712
Test: atest CtsGraphicsTestCases
Test: atest CtsGraphicsTestCasesRavenwood
Test: Boot the device
Change-Id: I0e99fb56ef581b4f59944994d07fd5253208dc31