C2: Update graphic buffer allocation calls to allow odd dimensions

Use width and height aligned to multiples of two while allocating
graphic buffers in the encode path.

Also allow width and height to be odd while converting from RGB
to YUV.

This is necessary to allow encoders to support odd dimensions.

Bug: 329378524
Bug: 325679394
Test: atest CtsMediaEncoderTestCases:VideoEncoderTest
Change-Id: I30533df402603a83874408a49b2f15747f8e972d