Start car launcher successfully before next loop to avoid race condition.

ActivityManager needs to start car launcher successfully before next loop to avoid
race condition for test case testEglConfigs.

Bug: 138268375
Test: run cts -m CtsOpenGLTestCases
              -t android.opengl.cts.EglConfigTest#testEglConfigs

Change-Id: Ie2b7b80027e9d659e63b70173ec4db764fe12a87
Signed-off-by: yingzhex <yingzhenx.li@intel.com>
Signed-off-by: bing.deng <bing.deng@intel.com>