vrend: Fix wrong numlayers in vrend_make_view

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