MAINTAINERS: Update max30208 maintainership

Update MAX30208 temperature sensor driver maintainer.
The previous maintainer's email bounces and no longer works.
Also mark the driver as supported.

Reported-by: Dave Hansen <[e-mail]>
Closes: https://lore.kernel.org/linux-iio/[e-mail]/
Signed-off-by: Marcelo Schmitt <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

MAINTAINERS

···
 F:	drivers/regulator/max20086-regulator.c
 
 MAXIM MAX30208 TEMPERATURE SENSOR DRIVER
-M:	Rajat Khandelwal <[e-mail]>
+M:	Marcelo Schmitt <[e-mail]>
 L:	[e-mail]
-S:	Maintained
+S:	Supported
 F:	drivers/iio/temperature/max30208.c
 
 MAXIM MAX77650 PMIC MFD DRIVER