egl/android: Implement the eglSwapinterval for Android.

egl/android: Implement the eglSwapinterval for Android.

Implement the eglSwapinterval for Android platform to
enable the async mode for some GFX benchmarks such as
Daimler C217, CityBench.

Results of the dEQP-EGL.*swap_interval tests

'dEQP-EGL.functional.query_config.get_config_attrib.max_swap_interval'..
'dEQP-EGL.functional.query_config.get_config_attrib.min_swap_interval'..
'dEQP-EGL.functional.choose_config.simple.selection_only.max_swap_interval'..
'dEQP-EGL.functional.choose_config.simple.selection_only.min_swap_interval'..
'dEQP-EGL.functional.choose_config.simple.selection_and_sort.max_swap_interval'..
'dEQP-EGL.functional.choose_config.simple.selection_and_sort.min_swap_interval'..
'dEQP-EGL.functional.negative_api.swap_interval'..

 Test run totals:
   Passed:        7/7 (100.0%)
   Failed:        0/7 (0.0%)
   Not supported: 0/7 (0.0%)
   Warnings:      0/7 (0.0%)

Signed-off-by: Zhongmin Wu <zhongmin.wu@intel.com>
Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
[Emil Velikov: polish inline comment, add dEQP stats, s/dpy/disp/]
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>