Change reserved cache space as sum of cache quotas of all uids

Bug: 203650406
Test: atest
frameworks/base/core/tests/coretests/src/android/os/storage/StorageManagerBaseTest
atest
cts/tests/tests/os/src/android/os/storage/cts/StorageManagerTest#testComputeStorageCacheBytes
Change-Id: I72710c89961ecc16b27ebb0647798f28e2e810ca
4 files changed