Use cmdline instead for enabling heapprofd.

Because we also want to profile Java applications, which have longer
names, the character limit of comm is a problem. To avoid complexity, it
is preferable to apply the same logic for finding running processes
(which includes Java apps), and determining whether to profile a process
from startup.

Test: m
Test: flash sailfish
Test: setprop heapprofd.enable 1
      setprop heapprofd.enable.ls 1
      ls
      /system/bin/ls
      /system/bin/ls /

Bug: 120175590

Change-Id: Id0859d4a333efcb05883e611ea6a31a51468f82c