refactor(st-i2c): use fdt_read_uint32_default()

The function stm32_i2c_get_setup_from_fdt() was using fdt_getprop() to
to get some i2c node properties, and set a default value if the node
was not found. The function fdt_read_uint32_default() already does
this in a simpler way.
Remove useless STM32_I2C_SPEED_DEFAULT.

Change-Id: I74c6295bb5765ee7c7e0a9ae020b741f1fe022a6
Signed-off-by: Yann Gautier <yann.gautier@st.com>
diff --git a/include/drivers/st/stm32_i2c.h b/include/drivers/st/stm32_i2c.h
index 170d4cf..ccb574b 100644
--- a/include/drivers/st/stm32_i2c.h
+++ b/include/drivers/st/stm32_i2c.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2019, STMicroelectronics - All Rights Reserved
+ * Copyright (c) 2016-2024, STMicroelectronics - All Rights Reserved
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -294,7 +294,6 @@
 /* STM32 specific defines */
 #define STM32_I2C_RISE_TIME_DEFAULT		25	/* ns */
 #define STM32_I2C_FALL_TIME_DEFAULT		10	/* ns */
-#define STM32_I2C_SPEED_DEFAULT			I2C_SPEED_STANDARD
 #define STM32_I2C_ANALOG_FILTER_DELAY_MIN	50	/* ns */
 #define STM32_I2C_ANALOG_FILTER_DELAY_MAX	260	/* ns */
 #define STM32_I2C_DIGITAL_FILTER_MAX		16