Rename map names in read_mapinfo

ART is removing dependency on ashmem for naming maps. Due to this, the
naming of the mappings have changed. Rename them in the debug info so
that it is working.

Also remove "/dev/ashmem/libc malloc", its now "anon:libc malloc" which
is already tested earlier in the code.

Bug: 111903542
Change-Id: I5071384f87701af208d6471c66ba425ccbda22ec
Signed-off-by: Joel Fernandes (Google) <joelaf@google.com>
Signed-off-by: Joel Fernandes <joelaf@google.com>