ANDROID: GKI: db845c: 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: I58decaf3e5d3eb7e06863e5e279f98159be13e13
Signed-off-by: T.J. Mercier <tjmercier@google.com>