memstats_gnueabil.py: minor fix
memstats_gnueabil.py: minor fix

Drop subSymbol value at level1
Otherwise there is possibility of a bug during parsing of "fill" line.

Change-Id: I6800ced4cdf2143bb7a0dacc88f887b817d5e38a
Signed-off-by: Vyacheslav Tyrtov <38597c8917b3be53f137e2c64dae73748ee4c1f0@samsung.com>

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