Platform: Update Musca-B1 and S1 upgrade strategies

The SWAP and OVERWRITE_ONLY upgrade strategies are now supported, so
note this in the documentation. Also, RAM_LOADING was never supported,
but previously, only NO_SWAP was allowed, so forbid RAM_LOADING in
CMake explicitly.

Signed-off-by: Balint Matyi <Balint.Matyi@arm.com>
Change-Id: Ifa5e4e5a453f5b2e7321646ddea78571544fd8e7
diff --git a/docs/user_guides/tfm_secure_boot.rst b/docs/user_guides/tfm_secure_boot.rst
index 8a429b2..54c84d9 100644
--- a/docs/user_guides/tfm_secure_boot.rst
+++ b/docs/user_guides/tfm_secure_boot.rst
@@ -235,9 +235,9 @@
 +-------------+-----------------+---------------+----------+-------------+-----------------+
 | Musca-A     | No              | No            | No       | No          | Yes             |
 +-------------+-----------------+---------------+----------+-------------+-----------------+
-| Musca-B1    | Yes             | No            | No       | Yes         | No              |
+| Musca-B1    | Yes             | Yes           | Yes      | Yes         | No              |
 +-------------+-----------------+---------------+----------+-------------+-----------------+
-| Musca-S1    | Yes             | No            | No       | Yes         | No              |
+| Musca-S1    | Yes             | Yes           | Yes      | Yes         | No              |
 +-------------+-----------------+---------------+----------+-------------+-----------------+
 | AN524       | Yes             | No            | No       | Yes         | No              |
 +-------------+-----------------+---------------+----------+-------------+-----------------+
@@ -694,8 +694,8 @@
     IMAGE2ADDRESS: 0x10180000
     IMAGE2FILE: \Software\tfm_sig1.bin ; TF-M regression test binary blob
 
-Executing firmware upgrade on Musca-B1 board
---------------------------------------------
+Executing firmware upgrade on Musca-B1 and Musca-S1 boards
+----------------------------------------------------------
 After the two images have been built, they can be concatenated to create the
 combined image using ``srec_cat``: