MMNGRBUF v0.1
	1. Initial Gen3 support.

MMNGRBUF v0.2
	1. Change MMNGRBUF driver into a DT-compatible driver.

MMNGRBUF v0.3
	1. Deal with dma_buf_ops changes in kernel v4.6.

MMNGRBUF v0.4
	1. Move duplicate definitions in user header files and driver header files
           to common header files.

MMNGRBUF v0.5
	1. Minor cleanup in unused header file.

MMNGRBUF v0.6
	1. Add lacking error handling for close().

MMNGRBUF v0.7
	1. Add function prototype declaration.

MMNGRBUF v1.0
	1. Update to MMNGRBUF v1.0

MMNGRBUF v1.1
	1. Fix build error due to dma_ops_buf change in kernel version 4.14.
	2. Use embedded function name in error messages.

MMNGRBUF v1.2
	1. Improve error handling in close() function.
	2. Improve error handling for import phases.

MMNGRBUF v1.3
	1. Fix dmabuf refcount handling on mm_ioc_import_start() failure

MMNGRBUF v1.4
	1. Fix build errors in kernel version 5.4
	2. Fix a race between close() and dmabuf_map_dma_buf() callbacks
	3. Remove kernel dmabuf map/unmap hooks
