hwmon: (adm9240) Add missing dependency on REGMAP_I2C

[ Upstream commit 14849a2e ]

This driver requires REGMAP_I2C to be selected in order to get access to
regmap_config and devm_regmap_init_i2c. Add the missing dependency.

Fixes: df885d91 ("hwmon: (adm9240) Convert to regmap")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Message-ID: <20241002-hwmon-select-regmap-v1-1-548d03268934@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>