meminfo: test: delete SmapsOrRollupReturn test

The test has become invalid due to addition of IsSmapsRollupSupported()
and its internal usage by SmapsOrRollup() method. The method now returns
success and returns statistics even if 'smaps_rollup' doesn't exist. It
does that by internally checking for it's existence and falls back to
using /proc/<pid>/smaps

Bug: 111694435
Test: mma -j

Change-Id: I1983a23f1f617aee126bc66a4c1fbd4abb50f565
Signed-off-by: Sandeep Patil <sspatil@google.com>