Reduce required physical fuses for Caliptra 1.x (#226)

Reduce required IDEVID CERT IDEVID ATTR fuse utilization to 352 bits and HSM IDENTIFIER to 0 bits

Author: varuns-nvidia

Diff for: doc/Caliptra.md

@@ -1185,8 +1185,8 @@ The following table describes Caliptra's fuse map:
 | FMC KEY MANIFEST SVN            | 32              | ROM FMC RUNTIME | In-field programmable                           | FMC security version number. |
 | RUNTIME SVN                     | 128             | ROM FMC RUNTIME | In-field programmable                           | Runtime firmware security version number. |
 | ANTI-ROLLBACK DISABLE           | 1               | ROM FMC RUNTIME | SoC manufacturing or in-field programmable      | Disables anti-rollback support from Caliptra. (For example, if a Platform RoT is managing FW storage and anti-rollback protection external to the SoC.) |
-| IDEVID CERT IDEVID ATTR         | 768             | ROM FMC RUNTIME | SoC manufacturing                               | IDevID Certificate Generation Attributes. See [IDevID certificate section](#idevid-certificate)
-| IDEVID MANUF HSM IDENTIFIER     | 128             | ROM FMC RUNTIME | SoC manufacturing                               | Spare bits for Vendor IDevID provisioner CA identifiers. |
+| IDEVID CERT IDEVID ATTR         | 768, 352 used   | ROM FMC RUNTIME | SoC manufacturing                               | IDevID Certificate Generation Attributes. See [IDevID certificate section](#idevid-certificate). Caliptra only uses 352 bits. Integrator is not required to back the remaining 416 bits with physical fuses.
+| IDEVID MANUF HSM IDENTIFIER     | 128, 0 used     | ROM FMC RUNTIME | SoC manufacturing                               | Spare bits for Vendor IDevID provisioner CA identifiers. Caliptra does not use these bits. Integrator is not required to back these with physical fuses. |
 | LIFE CYCLE                      | 2               | ROM FMC RUNTIME | SoC manufacturing                               | **Caliptra Boot Media Integrated mode usage only**. SoCs that build with a Boot Media Dependent profile don’t have to account for these fuses.<br> - '00 - Unprovisioned <br> - '01 - Manufacturing<br> - '10 - Undefined<br> - '11 - Production<br> **Reset:** Can only be reset on powergood. |
 | LMS VERIFY                      | 1               | ROM             | In-field programmable                           | - 0 - Verify Caliptra firmware images with ECDSA-only.<br> - 1 - Verify Caliptra firmware images with both ECDSA and LMS. |
 | LMS REVOCATION                  | 32              | ROM             | In-field programmable                           | One-hot encoded list of revoked Vendor LMS Public Keys. |