IssueNo: #I5DVCM:getAppMemorySize和isRamConstrainedDevice实现不合理，需修改
Description: 调整getAppMemorySize和isRamConstrainedDevice实现，解决引用@ohos.application.appManager无法调用问题
Sig: SIG_ApplicationFramework
Feature or Bugfix: Bugfix
Binary Source: No