pinctrl: mcp23s08: Rename and change function that wraps regmap_update_bits()

The semantic of mcp_set_mask() was surprising to me when I first read
that driver. So it was unexpected that in the call

	mcp_set_mask(mcp, MCP_OLAT, mask, value);

value was a bool. Make the function a thinner wrapper around
regmap_update_bits() and rename it to also have a similar name.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230324164957.485924-2-u.kleine-koenig@pengutronix.deSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-mcp23s08.c

@@ -144,10 +144,9 @@ static int mcp_write(struct mcp23s08 *mcp, unsigned int reg, unsigned int val)
 	return regmap_write(mcp->regmap, reg << mcp->reg_shift, val);
 }
 
-static int mcp_set_mask(struct mcp23s08 *mcp, unsigned int reg,
-		       unsigned int mask, bool enabled)
+static int mcp_update_bits(struct mcp23s08 *mcp, unsigned int reg,
+			   unsigned int mask, unsigned int val)
 {
-	u16 val  = enabled ? 0xffff : 0x0000;
 	return regmap_update_bits(mcp->regmap, reg << mcp->reg_shift,
 				  mask, val);
 }
@@ -156,7 +155,7 @@ static int mcp_set_bit(struct mcp23s08 *mcp, unsigned int reg,
 		       unsigned int pin, bool enabled)
 {
 	u16 mask = BIT(pin);
-	return mcp_set_mask(mcp, reg, mask, enabled);
+	return mcp_update_bits(mcp, reg, mask, enabled ? mask : 0);
 }
 
 static const struct pinctrl_pin_desc mcp23x08_pins[] = {
@@ -310,7 +309,7 @@ static int mcp23s08_get(struct gpio_chip *chip, unsigned offset)
 
 static int __mcp23s08_set(struct mcp23s08 *mcp, unsigned mask, bool value)
 {
-	return mcp_set_mask(mcp, MCP_OLAT, mask, value);
+	return mcp_update_bits(mcp, MCP_OLAT, mask, value ? mask : 0);
 }
 
 static void mcp23s08_set(struct gpio_chip *chip, unsigned offset, int value)
@@ -333,7 +332,7 @@ mcp23s08_direction_output(struct gpio_chip *chip, unsigned offset, int value)
 	mutex_lock(&mcp->lock);
 	status = __mcp23s08_set(mcp, mask, value);
 	if (status == 0) {
-		status = mcp_set_mask(mcp, MCP_IODIR, mask, false);
+		status = mcp_update_bits(mcp, MCP_IODIR, mask, 0);
 	}
 	mutex_unlock(&mcp->lock);
 	return status;