ANDROID: cpufreq: times: fix proc_time_in_state_show

Read times from p->time_in_state. Remove the "times" pointer, which is
never initialized.

Bug: 75238970
Test: /proc/<pid>/time_in_state now shows some nonzero values
Change-Id: I2f375b64ec39de034da3e24e5e5fb58b04958b76
Signed-off-by: Connor O'Brien <connoro@google.com>