fwk/sunflower: Increase KB controller I2C to 1MHz

From 400Mhz.
See definitions in docs/zephyr/zephyr_i2c.md
Hopefully with this we can make KB scan faster.

BUG=Sometimes keypresses seem to be lost
BRANCH=fwk-sunflower-26784
TEST=

Signed-off-by: Daniel Schaefer <dhs@frame.work>

Author: JohnAZoidberg

zephyr/program/framework/sunflower/i2c.dtsi

@@ -155,7 +155,7 @@
 &i2c5_0 {
 	status = "okay";
 	label = "I2C_PORT5";
-	clock-frequency = <I2C_BITRATE_FAST>;
+	clock-frequency = <I2C_BITRATE_FAST_PLUS>;
 	pinctrl-0 = <&i2c5_0_sda_scl_gp33_36>;
 	pinctrl-names = "default";