Molly reports OEMCrypto errors when Device RSA private key is
loaded a second time in the same session. This occurs in privacy
mode when a service certificate is request and later a key request is
generated.
bug: 10815492
Merge of https://widevine-internal-review.googlesource.com/#/c/7823/
from Widevine cdm repo
Change-Id: I98999fb0e77597109b68c379eaaa4838d3f6dde4