This API will get the advertised memory size from the bootloader parameter passed to the kernel. The advertised memory size might be different from the MemTotal value in /proc/meminfo. This could be due the original design manufacturer (ODM) reserved part of the memory for the Trusted Execution Environment. Test: Run test caes Bug: 231718727 Change-Id: I06494cb9013048d73a83f2180a9241c2259d46eb