MAINTAINERS: Add an entry for Amlogic spi driver

Add Amlogic spi entry to MAINTAINERS to clarify the maintainers.

Signed-off-by: Xianwei Zhao <xianwei.zhao@amlogic.com>
Link: https://patch.msgid.link/20250718-spisg-v5-3-b8f0f1eb93a2@amlogic.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Xianwei Zhao

MAINTAINERS

@@ -1306,6 +1306,15 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/rtc/amlogic,a4-rtc.yaml
 F:	drivers/rtc/rtc-amlogic-a4.c
 
+AMLOGIC SPISG DRIVER
+M:	Sunny Luo <sunny.luo@amlogic.com>
+M:	Xianwei Zhao <xianwei.zhao@amlogic.com>
+L:	linux-amlogic@lists.infradead.org
+L:	linux-spi@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/spi/amlogic,a4-spisg.yaml
+F:	drivers/spi/spi-amlogic-spisg.c
+
 AMPHENOL CHIPCAP 2 DRIVER
 M:	Javier Carrasco <javier.carrasco.cruz@gmail.com>
 L:	linux-hwmon@vger.kernel.org