clearfog: blink the white LED slower once we've settled on a slot

This ensures that the pattern is different between the "immutable"
bootloader (which isn't updated by RAUC) and the target slot which is
updated by RAUC.

One has to be careful about changing the GRPFREQ while the LEDs are
blinking [1]. In my testing, turning the LED off first works.

[1] https://e2e.ti.com/support/power_management/led_driver/f/192/t/145096?TLC59116-blinking-period-adjustment-oddity

Change-Id: I4e1570af69b67efcefb73d82138f1c13c8df86bc
diff --git a/board/czechlight/clearfog/boot.scr.txt b/board/czechlight/clearfog/boot.scr.txt
index efca0b6..5a12f39 100644
--- a/board/czechlight/clearfog/boot.scr.txt
+++ b/board/czechlight/clearfog/boot.scr.txt
@@ -1,3 +1,12 @@
+# status LED blinking: white, 50% duty cycle, rather fast, but not the fastet blinking
+i2c dev 1
+i2c mw 0x60 0x16 0x00
+i2c mw 0x60 0x12 0x80
+i2c mw 0x60 0x13 0x06
+i2c mw 0x60 0x16 0x3f
+i2c mw 0x60 0x0a 0x80
+i2c mw 0x60 0x0b 0x80
+i2c mw 0x60 0x0c 0x80
 setenv bootargs root=/dev/mmcblk0p${rauc_part} rauc.slot=${rauc_slot} czechlight=${czechlight} systemd.machine_id=${machineid} panic=10 oops=panic
 setenv bootargs ${bootargs} spidev.bufsiz=65535
 if test -n ${czechlight} && load mmc 0:${rauc_part} ${fdt_addr_r} /boot/${czechlight}-clearfog.dtb; then