Add SHA256 key management definition

This patch adds SHA256 key management definition for
wifi service to manipulate them.

Test: Build with dependent CLs
Bug: 68787540
Signed-off-by: Daichi Ueura <daichi.ueura@sony.com>
Change-Id: I35326c6803de48814564a619d42e217a06aaf06f
(Cherry-picked from commit dc3f6ee703d9a0e7f6d735c6c0e22a6bc45c726c)