i2c: mux: remove incorrect of_match_ptr annotations

Building with W=1 shows a warning about ltc4306_of_match and
i2c_mux_reg_of_match being unused when CONFIG_OF is disabled:

    drivers/i2c/muxes/i2c-mux-ltc4306.c:200:34: error: unused variable 'ltc4306_of_match' [-Werror,-Wunused-const-variable]
    drivers/i2c/muxes/i2c-mux-reg.c:242:34: error: unused variable 'i2c_mux_reg_of_match' [-Werror,-Wunused-const-variable]

Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20250225163700.4169480-1-arnd@kernel.org

drivers/i2c/muxes/i2c-mux-ltc4306.c

@@ -303,7 +303,7 @@ static void ltc4306_remove(struct i2c_client *client)
 static struct i2c_driver ltc4306_driver = {
 	.driver		= {
 		.name	= "ltc4306",
-		.of_match_table = of_match_ptr(ltc4306_of_match),
+		.of_match_table = ltc4306_of_match,
 	},
 	.probe		= ltc4306_probe,
 	.remove		= ltc4306_remove,

drivers/i2c/muxes/i2c-mux-reg.c

@@ -250,7 +250,7 @@ static struct platform_driver i2c_mux_reg_driver = {
 	.remove = i2c_mux_reg_remove,
 	.driver	= {
 		.name	= "i2c-mux-reg",
-		.of_match_table = of_match_ptr(i2c_mux_reg_of_match),
+		.of_match_table = i2c_mux_reg_of_match,
 	},
 };