soc: qdsp6v2: update function to access dmabuf from fd

The function name for accessing dmabuf from a file descriptor (fd)
has been modified. Use the new function to access the dmabuf by
passing fd.

Change-Id: I037da38ec32d2b16ae44b23f0159d1200e67e69b
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>