mb/siemens/mc_ehl2: Quick fix for PSE TSN phy interface type

Based on quick fix on this commit 7b0fe59be (soc/intel/ehl: Fix
logical bug for PseTsnGbePhyInterfaceType), disable PSE TSN
SGMII as the original intention is to set the PSE TSN phy
interface as RGMII.

Signed-off-by: Lean Sheng Tan <sheng.tan@9elements.com>
Change-Id: Id2e05b19f156621a945110791038bc0d19a0aad0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64491
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com>
diff --git a/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb b/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
index 9883fd9..81f68e2 100644
--- a/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
+++ b/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
@@ -102,8 +102,6 @@
 	# TSN GBE related UPDs
 	register "PchTsnGbeLinkSpeed" = "Tsn_1_Gbps"
 	register "PchTsnGbeSgmiiEnable" = "1"
-	register "PseTsnGbeSgmiiEnable[0]" = "1"
-	register "PseTsnGbeSgmiiEnable[1]" = "1"
 	register "PseDmaOwn[0]" = "Host_Owned"
 	register "PseDmaOwn[1]" = "Host_Owned"