Revert "Export HasKeyRole's coerceKeyRole function"

This reverts commit 450fc00.

Author: smelc

cardano-api/internal/Cardano/Api/Certificate.hs

@@ -100,6 +100,7 @@ import           Cardano.Api.Value
 
 import           Cardano.Ledger.BaseTypes (strictMaybe)
 import qualified Cardano.Ledger.Coin as L
+import qualified Cardano.Ledger.Keys as Ledger
 
 import           Control.Monad.Except (MonadError (..))
 import           Data.ByteString (ByteString)

cardano-api/internal/Cardano/Api/ReexposeLedger.hs

@@ -18,7 +18,7 @@ module Cardano.Api.ReexposeLedger
   , hashVerKeyVRF
   , hashWithSerialiser
   , PoolParams (..)
-  , HasKeyRole (..)
+  , HasKeyRole
   , MIRPot (..)
   , MIRTarget (..)
   , MIRCert (..)
@@ -221,7 +221,7 @@ import           Cardano.Ledger.Core (Era (..), EraPParams (..), EraTxOut, PPara
 import           Cardano.Ledger.Credential (Credential (..), credToText)
 import           Cardano.Ledger.Crypto (ADDRHASH, Crypto, StandardCrypto)
 import           Cardano.Ledger.DRep (DRep (..), drepAnchorL, drepDepositL, drepExpiryL)
-import           Cardano.Ledger.Keys (HasKeyRole (..), KeyHash (..), KeyRole (..), VKey (..),
+import           Cardano.Ledger.Keys (HasKeyRole, KeyHash (..), KeyRole (..), VKey (..),
                    hashWithSerialiser)
 import           Cardano.Ledger.Plutus.Data (Data (..), unData)
 import           Cardano.Ledger.Plutus.Language (Language, Plutus, languageToText, plutusBinary)