Fix keyname generation issue

The keyname binded to keyring return a wrong string when there are binary char larger than 127,
the sign extension will introduce unexpect FFFFFF string to the keyname.

Bug: 65423023
Test: local build with boot test and device encryption status check. 

Change-Id: I26482c98ac1858a63b9f5c3f84a8699fd6a21cd7
Signed-off-by: Ai, Ting A <ting.a.ai@intel.com>
Signed-off-by: Chen, Luhai <luhai.chen@intel.com>
1 file changed