tests/qtest: add tests for ADM1266

The ADM1266 can have string fields written by the driver, so
it's worth specifically testing.

Reviewed-by: Hao Wu <wuhaotsh@google.com>
Acked-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Titus Rwantare <titusr@google.com>
[PMD: Cover file in MAINTAINERS]
Message-ID: <20231023-staging-pmbus-v3-v4-6-07a8cb7cd20a@google.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index 178b763..67086ac 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -862,6 +862,7 @@
 F: hw/sensor/adm1266.c
 F: include/hw/*/npcm*
 F: tests/qtest/npcm*
+F: tests/qtest/adm1266-test.c
 F: pc-bios/npcm7xx_bootrom.bin
 F: roms/vbootrom
 F: docs/system/arm/nuvoton.rst