Perfprofd: Move dropbox code to its own static library

Preparation to move this to generic code.

(cherry picked from commit db1628647e81dc2d9a62471d4f3b78c84069040e)

Bug: 73175642
Test: mmma system/extras/perfprofd
Test: perfprofd_test
Merged-In: I2cad55f201ff8af9acfe8e8e34c6bafea8ef1285
Change-Id: I2cad55f201ff8af9acfe8e8e34c6bafea8ef1285
6 files changed