[NRC/N10] NPU driver API interface

[NRC/N10] NPU driver API interface

In http://suprem.sec.samsung.net/confluence/pages/viewpage.action?pageId=126187176
this is about N10 and N10's dependencies

V1:
Added details regarding the ioctl calls and signal handling

V2:
Updated interface to accomodate update in overall design for NPU design

V3:
Updated to use offset, and minor bug fixes

V4:
Updated with ioctl design
UIO design needed access to physical address in user side

V5:
Added interface to pass dmabuf_fd to kernel driver for physical address access
Added an extra identifier when setting up npu device

V6:
Updated based on blocking I/O

Signed-off-by: Parichay Kapoor <pk.kapoor@samsung.com>