ub: uburma support open/release file ops

driver inclusion
category: feature
bugzilla: NA
CVE: NA

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Uburma support open/release file ops.
In open operation, it will init uburma_file struct and store it in
private date of file. In release operation, it will release this struct.

Signed-off-by: Guoxin Qian <qianguoxin@huawei.com>
Signed-off-by: Yizhen Fan <fanyizhen@huawei.com>