Added SPCI to the glossary

Change-Id: I576ae161477f4a69336d15a7741e566bb103124a
Signed-off-by: Artsem Artsemenka <artsem.artsemenka@arm.com>

docs/global_substitutions.txt

@@ -38,6 +38,7 @@
 .. |SMCCC| replace:: :term:`SMCCC`
 .. |SoC| replace:: :term:`SoC`
 .. |SP| replace:: :term:`SP`
+.. |SPCI| replace:: :term:`SPCI`
 .. |SPD| replace:: :term:`SPD`
 .. |SPM| replace:: :term:`SPM`
 .. |SVE| replace:: :term:`SVE`

docs/glossary.rst

@@ -129,6 +129,9 @@ You can find additional definitions in the `Arm Glossary`_.
    SP
       Secure Partition
 
+   SPCI
+      Secure Partition Client Interface
+
    SPD
       Secure Payload Dispatcher