LU-6142 fid: SPDX for FID/FLD code

LU-6142 fid: SPDX for FID/FLD code

Convert from verbose license text to SDPX.

Test-Parameters: trivial
Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: Iaadd10e60e08fb3f551812289e2c30de12824fd4
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/55886
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: jsimmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>