ANDROID: virtio: disable virtio_dma_buf callback checks with CFI

CONFIG_CFI_CLANG breaks cross-module function address equality, which
breaks virtio_dma_buf as it compares a locally taken function address to
a one passed from a different module. Remove these sanity checks for now
to allow Cuttlefish to boot with CFI.

Bug: 178495907
Bug: 199547335
Change-Id: I508e2fa9e3ddd888dc2fdb743cec20a400eaf1f5
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Alistair Delva <adelva@google.com>