Remove network capability from CAPABILITY_ALL constant.

We shouldn't include it until we also update OomAdjuster
to add it to certain processes.

Fixes: 181902246
Test: atest ./tests/app/src/android/app/cts/ActivityManagerFgsBgStartTest.java
Change-Id: I3bfdd2b01c3ba8010e96177e41fc90be3dce8a55
Merged-In: I888764ff22fba92fe2cccf3d8442ed318a19ad2a