Up the dimension key limit for CpuTimePerUidFreq

This atom logs time spent on cpu per frequency per uid.
On marlin, there are 27 frequency steps per uid (should be 50+ if
flatten to both cores)
On walleye, there are 52 frequency steps per uid.
So it easily goes to 6k data.

Soft limit set to 6k now.
Hard limit set to 10k to accommodate future processors

Memory impact: on marlin, start memory no config is 2,346K
after using this atom in one guage metric, it is 3,067K

Bug: 72505991
Test: cts test
Change-Id: I067a32e54e4a457fdf9a25911aa16030e893ef4d