hw/sensor: add ADM1266 device model

The ADM1266 is a cascadable super sequencer with margin control and
fault recording.
This commit adds basic support for its PMBus commands and models
the identification registers that can be modified in a firmware
update.

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-v4-5-07a8cb7cd20a@google.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index 0e1d063..178b763 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -859,6 +859,7 @@
 L: qemu-arm@nongnu.org
 S: Supported
 F: hw/*/npcm*
+F: hw/sensor/adm1266.c
 F: include/hw/*/npcm*
 F: tests/qtest/npcm*
 F: pc-bios/npcm7xx_bootrom.bin