mfd: Kconfig: Drop OF dependency on MFD_MAX5970

This is the only Kconfig symbol that depends on OF while selecting the common
driver for several chips. Drop this unneeded dependency and make the component
available on non-OF systems along with wider compile test.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20251111105320.750131-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Lee Jones <lee@kernel.org>

Author: andy-shev

drivers/mfd/Kconfig

@@ -896,7 +896,7 @@ config MFD_88PM886_PMIC
 
 config MFD_MAX5970
 	tristate "Maxim 5970/5978 power switch and monitor"
-	depends on I2C && OF
+	depends on I2C
 	select MFD_SIMPLE_MFD_I2C
 	help
 	  This driver controls a Maxim 5970/5978 switch via I2C bus.