Merge "Drop supplementary groups for child zygotes. am: 7c8779c0 am: 80cfa981 am: 75f35b04 am: 69db3557 am: 3bccad39" into rvc-qpr-dev-plus-aosp am: 67910b15

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11691614

Change-Id: I0c6280c37606350c6c9975ab892b2e3024cdfeea