i2c: Export i2c_deblock_gpio_loop()

Export the i2c_deblock_gpio_loop() so it can be used in other places in
U-Boot. In particular, this is useful in the GPIO I2C driver, which claims
the SDA/SCL GPIOs and thus prevents the i2c_deblock() implementation from
claiming the pins as GPIOs again.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Heiko Schocher <hs@denx.de>
diff --git a/drivers/i2c/i2c-uclass.c b/drivers/i2c/i2c-uclass.c
index 25af1fa..86f5292 100644
--- a/drivers/i2c/i2c-uclass.c
+++ b/drivers/i2c/i2c-uclass.c
@@ -501,10 +501,10 @@
 	return dm_gpio_get_value(pin);
 }
 
-static int i2c_deblock_gpio_loop(struct gpio_desc *sda_pin,
-				 struct gpio_desc *scl_pin,
-				 unsigned int scl_count,
-				 unsigned int delay)
+int i2c_deblock_gpio_loop(struct gpio_desc *sda_pin,
+			  struct gpio_desc *scl_pin,
+			  unsigned int scl_count,
+			  unsigned int delay)
 {
 	int ret = 0;