[fix] CFI improvement (#1087)

Co-authored-by: Kor Nielsen <[email protected]>

FROZEN_IMAGES.sha384sum

@@ -1,3 +1,3 @@
 # WARNING: Do not update this file without the approval of the Caliptra TAC
-baf2ff6d900221337659251515381a7cc0ec860b15ab6b26dfb4d86a2abf37dc82c95b1b7658ffecaf1f773c009bc2d8  caliptra-rom-no-log.bin
-82e87a27e9120462aad521c23395528420c9560adb563f9a01dd12efa54a33aecc41c8c7eb9d977e541815491f1522ac  caliptra-rom-with-log.bin
+417f3d492dec902bb20d3f54fe54374a236e8f8aa5ae250d7de08dda6d12ea0c6f009d4ccbf83c6963c321a771788ea2  caliptra-rom-no-log.bin
+544c6e5244a35d6a39ba85fc8b90c3ef7816bb385d28ee46accf0475924a835b42418d9b10f6ad3e090fcfc25e1f0f1a  caliptra-rom-with-log.bin

rom/dev/src/flow/cold_reset/fw_processor.rs

@@ -335,10 +335,12 @@ impl FirmwareProcessor {
             image: venv.image,
         };
 
-        // Random delays for CFI glitch protection.
-        for _ in 0..4 {
-            CfiCounter::delay();
-        }
+        // Random delay for CFI glitch protection.
+        CfiCounter::delay();
+        CfiCounter::delay();
+        CfiCounter::delay();
+        CfiCounter::delay();
+
         let mut verifier = ImageVerifier::new(venv);
         let info = verifier.verify(manifest, img_bundle_sz, ResetReason::ColdReset)?;