Set a maximum accepted challenge size.

This is in accordance with the maximum challenge size specified in the
generateCsrV2 request defined in the IRemotelyProvisionedComponent v3
HAL.

Test: atest VtsHalRemotelyProvisionedComponentTargetTest
Change-Id: Ie3ef223ec49f83736813c9206c49fef5de5c10ca
1 file changed