Revert "mb/google/brya: Fix mux_conn index used by ec/google/chromeec"

BUG=b:368661724, b:434033860, b:407590653, b:398060672
TEST: `emerge-brya coreboot chromeos-bootimage`, flash and boot mithrax
to recovery screen and verify it can detect USB recovery stick in USB-C
ports.

This reverts commit 9207621d23.

Change-Id: I453562ab5802c7b9e38b7555415747dd9205aacb
Signed-off-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/88596
Reviewed-by: Eran Mitrani <mitrani@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/brya/variants/felwinter/overridetree.cb

@@ -350,8 +350,8 @@ chip soc/intel/alderlake
 		end
 		device ref pch_espi on
 			chip ec/google/chromeec
-				use conn1 as mux_conn[0]
-				use conn2 as mux_conn[1]
+				use conn1 as mux_conn[1]
+				use conn2 as mux_conn[0]
 				device pnp 0c09.0 on end
 			end
 		end

src/mainboard/google/brya/variants/mithrax/overridetree.cb

@@ -307,8 +307,8 @@ chip soc/intel/alderlake
 		end
 		device ref pch_espi on
 			chip ec/google/chromeec
-				use conn1 as mux_conn[0]
-				use conn2 as mux_conn[1]
+				use conn1 as mux_conn[1]
+				use conn2 as mux_conn[0]
 				device pnp 0c09.0 on end
 			end
 		end