docs: remove entries of the deleted platforms

Remove the details of the platforms from the 'deprecated
platforms' table those are already deleted.
This is in-sync with other depreaction tables [1] which
only has deprecation entries and not deleted entries.

[1]: https://trustedfirmware-a.readthedocs.io/en/latest/about/release-information.html#removal-of-deprecated-interfaces

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: If8c8e4ba4e7fa88ea83632202d17c7d35cdc200a
diff --git a/docs/plat/index.rst b/docs/plat/index.rst
index 43f4898..4aabc6d 100644
--- a/docs/plat/index.rst
+++ b/docs/plat/index.rst
@@ -69,20 +69,12 @@
 +----------------+----------------+--------------------+--------------------+
 |    Platform    |     Vendor     | Deprecated version |  Deleted version   |
 +================+================+====================+====================+
-|    sgm775      |      Arm       |        2.5         |       2.7          |
-+----------------+----------------+--------------------+--------------------+
-|    mt6795      |      MTK       |        2.5         |       2.7          |
-+----------------+----------------+--------------------+--------------------+
 |    sgi575      |      Arm       |        2.8         |       TBD          |
 +----------------+----------------+--------------------+--------------------+
 |    rdn1edge    |      Arm       |        2.8         |       TBD          |
 +----------------+----------------+--------------------+--------------------+
-|    tc0         |      Arm       |        2.8         |       2.10         |
-+----------------+----------------+--------------------+--------------------+
 |    tc1         |      Arm       |        2.10        |       TBD          |
 +----------------+----------------+--------------------+--------------------+
-|    rde1edge    |      Arm       |        2.9         |       2.11         |
-+----------------+----------------+--------------------+--------------------+
 
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