Doc: Add changelog for 1.1 release

Create changelog document for 1.1 release and add it to the main
changelog document.
Add 1.1 release to readme.rst
Update version number in tfm_version.h
Update version number in Doxygen CMake files.

Change-Id: Icb81ab1e5994228772884c7a1dcb878533dcfa33
Signed-off-by: Mate Toth-Pal <mate.toth-pal@arm.com>
diff --git a/secure_fw/spm/include/tfm_version.h b/secure_fw/spm/include/tfm_version.h
index 461ba97..086a377 100644
--- a/secure_fw/spm/include/tfm_version.h
+++ b/secure_fw/spm/include/tfm_version.h
@@ -12,7 +12,7 @@
  * Defines for TFM version.
  */
 #define VERSION_MAJOR    1
-#define VERSION_MINOR    0
+#define VERSION_MINOR    1
 #define VERSION_STRING   ""
 
 #endif /* __TFM_VERSION_H__ */