trusty/apploader: Add missing doc for enum value

Document the APPLOADER_ERR_POLICY_VIOLATION value in enum
apploader_error.

Bug: 208968719
Change-Id: Ia9b17f4ea705d13567b2ba74f2dcd6df5a0c7d73
(cherry picked from commit c5253819f85486ee40ae13f59742afeba8f8ef58)
Merged-In: Ia9b17f4ea705d13567b2ba74f2dcd6df5a0c7d73
1 file changed