regulator: cpr3-regulator: always create aging debugfs files if aging used

Ensure that aging debugfs files are created in the case that an
aging measurement has already been completed by the time that the
cpr3_regulator_debugfs_ctrl_add() function is called.

Change-Id: Iacb1496d6ccec5dce972988f453e8038069e4c7a
Signed-off-by: David Collins <collinsd@codeaurora.org>