Add missed thread safety annotations

Summary:
This is needed for upcoming commit "sync.h: Make runtime lock checks
require compile-time lock checks" to pass.

This is a backport of [[bitcoin/bitcoin#19668 | core#19668]] [2/5]
bitcoin/bitcoin@3ddc150

Depends on D10161

Test Plan:
With TSAN:
`ninja check check-functional`

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D10162

src/wallet/scriptpubkeyman.h

@@ -679,7 +679,8 @@ class DescriptorScriptPubKeyMan : public ScriptPubKeyMan {
     bool m_decryption_thoroughly_checked = false;
 
     bool AddDescriptorKeyWithDB(WalletBatch &batch, const CKey &key,
-                                const CPubKey &pubkey);
+                                const CPubKey &pubkey)
+        EXCLUSIVE_LOCKS_REQUIRED(cs_desc_man);
 
     KeyMap GetKeys() const EXCLUSIVE_LOCKS_REQUIRED(cs_desc_man);
 

src/wallet/wallet.h

@@ -1568,7 +1568,7 @@ class CWallet final : public WalletStorage,
     void LoadActiveScriptPubKeyMan(uint256 id, OutputType type, bool internal);
 
     //! Create new DescriptorScriptPubKeyMans and add them to the wallet
-    void SetupDescriptorScriptPubKeyMans();
+    void SetupDescriptorScriptPubKeyMans() EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
 
     //! Return the DescriptorScriptPubKeyMan for a WalletDescriptor if it is
     //! already in the wallet