Fix worng value of 'TOTAL of Rss Total' when dumpsys meminfo

Use memInfo.getTotalRss instead of memInfo.getTotalPss
to get the value of 'TOTAL of Rss Total'.

bug 182328162

Signed-off-by: weihua.li <weihua.li@unisoc.com>
Change-Id: I5487abe4870e10f4ee79c86c0ad0e75a3843deb1