Revert "Platform: Remove Musca_A platform code (Deprecation)"

This reverts commit a29d6695749aedb4015320af18e782b85744600a.

Reason for revert: Musca-A is still a reference platform for 1 user.

Change-Id: I3a96d5157677390360aaa82eac96b9810db58c43
diff --git a/docs/getting_started/tfm_integration_guide.rst b/docs/getting_started/tfm_integration_guide.rst
index 22f61e2..fd964cd 100644
--- a/docs/getting_started/tfm_integration_guide.rst
+++ b/docs/getting_started/tfm_integration_guide.rst
@@ -23,6 +23,7 @@
 - Cortex-M23 IoT Kit subsystem for MPS2+ (AN519)
 - Corstone-300 Ecosystem FVP (Cortex-M55 SSE-300 MPS2+)
 - Corstone-300 Ethos-U55 FVP (Cortex-M55 plus Ethos-U55 SSE-300 MPS3)
+- Musca-A test chip board (Cortex-M33 SSE-200 subsystem)
 - Musca-B1 test chip board (Cortex-M33 SSE-200 subsystem)
 - Musca-S1 test chip board (Cortex-M33 SSE-200 subsystem)
 - CoreLink SSE-200 Subsystem for MPS3 (AN524)
@@ -40,6 +41,9 @@
 More information about subsystems supported by the MPS2+ board can be found in:
 `MPS2+ homepage <https://developer.arm.com/products/system-design/development-boards/fpga-prototyping-boards/mps2>`__
 
+More information about the Musca-A test chip board can be found in:
+`Musca-A homepage <https://developer.arm.com/products/system-design/development-boards/iot-test-chips-and-boards/musca-a-test-chip-board>`__
+
 More information about the Musca-B1 test chip board can be found in:
 `Musca-B1 homepage <https://www.arm.com/products/development-tools/development-boards/musca-b1-iot>`__