android: Use NDK structure for third party modules

android: Use NDK structure for third party modules

Locate glslang and spirv directories under shaderc directory.
This allows the layers build to optionally use the NDK sources.
For glslang and spirv and shaderc-
 Use LOCAL_STATIC_LIBRARIES instead of LOCAL_C_INCLUDES to find headers.
 Use import-module instead of PREBUILT_STATIC_LIBRARY.