Return TotalMemory size when ddr size is not present

When the ddr size is not present or it is invalid, getAdvertisedMem()
must return getTotalMemory() size.

Bug: 278977257
Test: atest frameworks/base/core/tests/coretests/src/android/os/ProcessTest.java
Change-Id: I2323d79d869a4c58eb29d0cae351144f357b867d
2 files changed