ARMv7 target is driven by ARM_ARCH_MAJOR==7

External build environment shall sets directive ARM_ARCH_MAJOR to 7
to specify a target ARMv7-A core.

As ARM-TF expects AARCH to be set, ARM_ARCH_MAJOR==7 mandates
AARCH=aarch32.

The toolchain target architecture/cpu is delegated after the platform
configuration is parsed. Platform shall define target core through
ARM_CORTEX_A<x>=yes, <x> being 5, 7, 9, 12, 15 and/or 17.

Platform can bypass ARM_CORTEX_A<x>=yes directive and provide straight
the toolchain target directive through MARCH32_DIRECTIVE.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
diff --git a/maintainers.rst b/maintainers.rst
index 388073e..701ea17 100644
--- a/maintainers.rst
+++ b/maintainers.rst
@@ -91,6 +91,11 @@
 -  docs/plat/xilinx-zynqmp.md
 -  plat/xilinx/\*
 
+ARMv7 architecture sub-maintainer
+---------------------------------
+
+Etienne Carriere (etienne.carriere@linaro.org, `etienne-lms`_)
+
 .. _danh-arm: https://github.com/danh-arm
 .. _davidcunado-arm: https://github.com/davidcunado-arm
 .. _jenswi-linaro: https://github.com/jenswi-linaro
@@ -100,3 +105,4 @@
 .. _TonyXie06: https://github.com/TonyXie06
 .. _rkchrome: https://github.com/rkchrome
 .. _sorenb-xlnx: https://github.com/sorenb-xlnx
+.. _etienne-lms: https://github.com/etienne-lms