libmeminfo: Fix libmeminfo_test for x86 architecture am: bef9540d57 am: c37a1d346a am: dc2171bc6e am: 41f2053b51

Original change: https://android-review.googlesource.com/c/platform/system/memory/libmeminfo/+/1441352

Change-Id: I3811e5745c7d89d15252a6e07ee8e986bb559234