fix(rpi3): use correct define for GPIO reg_clr

Changed reg_clr to use the base address + RPI3_GPIO_GPCLR,
this corrects the reg_clr address.

Signed-off-by: Tushar Khandelwal <tushar.khandelwal@arm.com>
Signed-off-by: Abhi Singh <abhi.singh@arm.com>
Change-Id: I9ca50905efd4c640f143783c5a00676b246a2e26
diff --git a/drivers/rpi3/gpio/rpi3_gpio.c b/drivers/rpi3/gpio/rpi3_gpio.c
index 55a8832..460afe1 100644
--- a/drivers/rpi3/gpio/rpi3_gpio.c
+++ b/drivers/rpi3/gpio/rpi3_gpio.c
@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2019, Linaro Limited
  * Copyright (c) 2019, Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
+ * Copyright (c) 2024, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -120,7 +121,7 @@
 	int regN = gpio / 32;
 	int shift = gpio % 32;
 	uintptr_t reg_set = reg_base + RPI3_GPIO_GPSET(regN);
-	uintptr_t reg_clr = reg_base + RPI3_GPIO_GPSET(regN);
+	uintptr_t reg_clr = reg_base + RPI3_GPIO_GPCLR(regN);
 
 	switch (value) {
 	case GPIO_LEVEL_LOW: