The old code is buggy and set numlayers to 1 for GL_TEXTURE_2D_ARRAY
when creating the view. Just change to use array_size directly.

This fixes such tests in CtsNativeHardwareTestCases:

android.hardware.nativehardware.cts.AHardwareBufferNativeTests#MultipleLayers_ColorTest_MipmapComplete_GL_RGB10_A2
android.hardware.nativehardware.cts.AHardwareBufferNativeTests#MultipleLayers_ColorTest_MipmapComplete_GL_RGB8
android.hardware.nativehardware.cts.AHardwareBufferNativeTests#MultipleLayers_ColorTest_MipmapComplete_GL_RGBA16F
android.hardware.nativehardware.cts.AHardwareBufferNativeTests#MultipleLayers_ColorTest_MipmapComplete_GL_RGBA8
android.hardware.nativehardware.cts.AHardwareBufferNativeTests#MultipleLayers_ColorTest_MipmapComplete_GL_SRGB8_ALPHA8_sRGB

Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Signed-off-by: Lepton Wu <lepton@chromium.org>