Size up the memory for the buffers from the buffer pool allocated in board
file.  Then adjust the reqbuf count depending the available memory.
Signed-off-by: NManjunath Hadli <manjunath.hadli@ti.com>
Signed-off-by: NLad, Prabhakar <prabhakar.lad@ti.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>