fix(el3-spmc): remove experimental flag

The EL3 SPMC is known to be deployed into end products and properly
tested since its introduction into TF-A v2.7.

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I96bb897cfefef20c33cfc39627b10746dce5485c
diff --git a/bl31/bl31.mk b/bl31/bl31.mk
index 3359526..f0776c4 100644
--- a/bl31/bl31.mk
+++ b/bl31/bl31.mk
@@ -27,7 +27,6 @@
 include lib/mpmm/mpmm.mk
 
 ifeq (${SPMC_AT_EL3},1)
-  $(warning "EL3 SPMC is an experimental feature")
   $(info Including EL3 SPMC makefile)
   include services/std_svc/spm/common/spm.mk
   include services/std_svc/spm/el3_spmc/spmc.mk
diff --git a/docs/getting_started/build-options.rst b/docs/getting_started/build-options.rst
index 43b13d6..e54b0b9 100644
--- a/docs/getting_started/build-options.rst
+++ b/docs/getting_started/build-options.rst
@@ -898,7 +898,7 @@
    Dispatcher option (``SPD=spmd``). When enabled (1) it indicates the SPMC
    component runs at the EL3 exception level. The default value is ``0`` (
    disabled). This configuration supports pre-Armv8.4 platforms (aka not
-   implementing the ``FEAT_SEL2`` extension). This is an experimental feature.
+   implementing the ``FEAT_SEL2`` extension).
 
 -  ``SPMC_AT_EL3_SEL0_SP`` : Boolean option to enable SEL0 SP load support when
    ``SPMC_AT_EL3`` is enabled. The default value if ``0`` (disabled). This