mb/google/volteer: Rename remaining pmc_mux/con to conn

CB:43090 renamed con to conn to avoid issues when building on Windows.
CB:42905 introduced more uses of the old name.

Adapt the latter to comply with the former.

Change-Id: I723141add5452fc541f67cb8591793f2d64cc231
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43141
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by:  Felix Singer <felixsinger@posteo.net>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Christian Walter <christian.walter@9elements.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/volteer/variants/volteer/overridetree.cb

@@ -163,7 +163,7 @@ chip soc/intel/tigerlake
 							probe DB_USB USB3_NO_A
 						end
 					end
-					chip drivers/intel/pmc_mux/con
+					chip drivers/intel/pmc_mux/conn
 						register "usb2_port_number" = "4"
 						register "usb3_port_number" = "2"
 						# SBU & HSL follow CC

src/mainboard/google/volteer/variants/voxel/overridetree.cb

@@ -111,14 +111,14 @@ chip soc/intel/tigerlake
 			# PMC.MUX device in the ACPI hierarchy.
 			chip drivers/intel/pmc_mux
 				device generic 0 on
-					chip drivers/intel/pmc_mux/con
+					chip drivers/intel/pmc_mux/conn
 						register "usb2_port_number" = "9"
 						register "usb3_port_number" = "1"
 						# SBU is fixed, HSL follows CC
 						register "sbu_orientation" = "TYPEC_ORIENTATION_NORMAL"
 						device generic 0 on end
 					end
-					chip drivers/intel/pmc_mux/con
+					chip drivers/intel/pmc_mux/conn
 						register "usb2_port_number" = "4"
 						register "usb3_port_number" = "2"
 						# SBU is fixed, HSL follows CC