HID: qvr: using different dma-buf APIs

Using dma_buf_vmap and dma_buf_vunmap
instead of dma_buf_kmap and dma_buf_kunmap.

Change-Id: I39132b3073141ebb0ac5e2f9f3637a52ed397448
Signed-off-by: rbandi <rohitbandi@codeaurora.org>