docs: interconnect.rst: add it to the driver-api guide

This is intended for Kernel hackers audience.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Reviewed-by: Georgi Djakov <georgi.djakov@linaro.org>

Documentation/driver-api/index.rst

@@ -36,6 +36,7 @@ available subsections can be seen below.
    i2c
    ipmb
    i3c/index
+   interconnect
    hsi
    edac
    scsi

Documentation/interconnect/interconnect.rst → Documentation/driver-api/interconnect.rst

 .. SPDX-License-Identifier: GPL-2.0
 
-:orphan:
-
 =====================================
 GENERIC SYSTEM INTERCONNECT SUBSYSTEM
 =====================================

MAINTAINERS

@@ -8326,7 +8326,7 @@ INTERCONNECT API
 M:	Georgi Djakov <georgi.djakov@linaro.org>
 L:	linux-pm@vger.kernel.org
 S:	Maintained
-F:	Documentation/interconnect/
+F:	Documentation/driver-api/interconnect.rst
 F:	Documentation/devicetree/bindings/interconnect/
 F:	drivers/interconnect/
 F:	include/dt-bindings/interconnect/