[nrf fromtree] drivers: i2c: nrfx_twi[m]: default to I2C_BITRATE_STANDARD

Instead of forcing a definition in Devicetree. Right now, SoC DT files
contain this default, but it should not be part of SoC DT files.

Signed-off-by: Gerard Marull-Paretas <[email protected]>
(cherry picked from commit 92c3495)

Author: gmarull

drivers/i2c/i2c_nrfx_twi_common.h

@@ -22,7 +22,8 @@ extern "C" {
 					  : I2C_NRFX_TWI_INVALID_FREQUENCY)
 #define I2C(idx) DT_NODELABEL(i2c##idx)
 #define I2C_FREQUENCY(idx)						       \
-	I2C_NRFX_TWI_FREQUENCY(DT_PROP(I2C(idx), clock_frequency))
+	I2C_NRFX_TWI_FREQUENCY(DT_PROP_OR(I2C(idx), clock_frequency,	       \
+					  I2C_BITRATE_STANDARD))
 
 struct i2c_nrfx_twi_common_data {
 	uint32_t dev_config;

drivers/i2c/i2c_nrfx_twim_common.h

@@ -28,7 +28,8 @@ extern "C" {
 
 #define I2C(idx)                DT_NODELABEL(i2c##idx)
 #define I2C_HAS_PROP(idx, prop) DT_NODE_HAS_PROP(I2C(idx), prop)
-#define I2C_FREQUENCY(idx)      I2C_NRFX_TWIM_FREQUENCY(DT_PROP(I2C(idx), clock_frequency))
+#define I2C_FREQUENCY(idx)      I2C_NRFX_TWIM_FREQUENCY(DT_PROP_OR(I2C(idx), clock_frequency,      \
+								   I2C_BITRATE_STANDARD))
 
 struct i2c_nrfx_twim_common_config {
 	nrfx_twim_t twim;