drivers/i2c/designware: Add 150MHz clock speed

BUG=b:143885765
TEST=I2C clock speed on trembyle is 400kHz

Change-Id: I50e904822823a6fc173d4d4b76f0882b4ce81ae8
Signed-off-by: Martin Roth <martinroth@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1970655
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39588
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/drivers/i2c/designware/dw_i2c.c

@@ -213,6 +213,13 @@ static const struct soc_clock {
 			.ns = 3000,
 		},
 	},
+	{
+		.clk_speed_mhz = 150,
+		.freq = {
+			.ticks = 600,
+			.ns = 4000,
+		},
+	},
 	{
 		.clk_speed_mhz = 216,
 		.freq = {