mfd: tps65217: Introduce dependency on CONFIG_OF

Currently the driver boots only via device tree hence add a
dependency on CONFIG_OF. This leaves with a bunch of unused code
so clean that up. This patch also makes use of probe_new function
in place of the probe function so as to avoid passing i2c_device_id.

Signed-off-by: Keerthy <j-keerthy@ti.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/regulator/tps65217-regulator.c

@@ -228,11 +228,6 @@ static int tps65217_regulator_probe(struct platform_device *pdev)
 	int i, ret;
 	unsigned int val;
 
-	if (tps65217_chip_id(tps) != TPS65217) {
-		dev_err(&pdev->dev, "Invalid tps chip version\n");
-		return -ENODEV;
-	}
-
 	/* Allocate memory for strobes */
 	tps->strobes = devm_kzalloc(&pdev->dev, sizeof(u8) *
 				    TPS65217_NUM_REGULATOR, GFP_KERNEL);