MAINTAINERS: Add the ASoC gpio audio amplifier entry

After contributing the component, add myself as the maintainer for the
ASoC gpio audio amplifier component.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Link: https://patch.msgid.link/20260513081702.317117-18-herve.codina@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: hcodina

MAINTAINERS

@@ -25032,6 +25032,13 @@ F:	include/sound/dmaengine_pcm.h
 F:	sound/core/pcm_dmaengine.c
 F:	sound/soc/soc-generic-dmaengine-pcm.c
 
+SOUND - SOC LAYER / GPIO AUDIO AMPLIFIER
+M:	Herve Codina <herve.codina@bootlin.com>
+L:	linux-sound@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/sound/gpio-audio-amp.yaml
+F:	sound/soc/codecs/simple-amplifier.c
+
 SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEMENT (ASoC)
 M:	Liam Girdwood <lgirdwood@gmail.com>
 M:	Mark Brown <broonie@kernel.org>