ANDROID: GKI: virtual_device: Add _totalram_pages to symbol list

They GKI system dmabuf heap was updated to include a sanity check for
requests that exceed the total amount of device memory.

Bug: 403200462
Change-Id: I798f46933fd6a89dead98b5afd71bf8c7bbe2795
Signed-off-by: T.J. Mercier <tjmercier@google.com>