mb/google/dedede/var/boxy: Enable 100M mode blink in RTL8111H LAN LED config

Enable bit 9 for 100M mode green LED blink.

Reference: 
- RTL8111H-CG Datasheet 1.92 section 7.2 for customizable led configuration

BUG=b:293983804
TEST=emerge-dedede coreboot and verify LAN LED behavior

Change-Id: Ice5686affcc014a2dfd35b7f579c8eaa38c2d3fe
Signed-off-by: Stanley Wu <stanley1.wu@lcfc.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77393
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Derek Huang <derekhuang@google.com>
diff --git a/src/mainboard/google/dedede/variants/boxy/overridetree.cb b/src/mainboard/google/dedede/variants/boxy/overridetree.cb
index fd6e992..2514efd 100644
--- a/src/mainboard/google/dedede/variants/boxy/overridetree.cb
+++ b/src/mainboard/google/dedede/variants/boxy/overridetree.cb
@@ -222,7 +222,7 @@
 		end # I2C 4
 		device pci 1c.2 on
 			chip drivers/net
-				register "customized_leds" = "0x05af"
+				register "customized_leds" = "0x07af"
 				register "wake" = "GPE0_DW0_03" # GPP_B3
 				register "stop_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_LOW(GPP_D4)"
 				register "device_index" = "0"