ANDROID: GKI: db845c: add new dma_buf symbols to list

In commit 8332311c ("misc: fastrpc: Fix incorrect DMA mapping unmap
request"), the symbols dma_buf_map_attachment_unlocked and
dma_buf_unmap_attachment_unlocked are now required to be used by the
db845c target, so add them to the symbol list to fix up the build.

2 function symbol(s) added
  'struct sg_table* dma_buf_map_attachment_unlocked(struct dma_buf_attachment*, enum dma_data_direction)'
  'void dma_buf_unmap_attachment_unlocked(struct dma_buf_attachment*, struct sg_table*, enum dma_data_direction)'

Fixes: 8332311c ("misc: fastrpc: Fix incorrect DMA mapping unmap request")
Change-Id: Ib634cfa9a88a6708893a938a7d48d542db5b7b61
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>