add xmclib as submodule

.gitmodules

@@ -131,3 +131,6 @@
 	path = hw/mcu/broadcom
 	url = https://github.com/adafruit/broadcom-peripherals.git
 	branch = main-build
+[submodule "hw/mcu/infineon/mtb-xmclib-cat3"]
+	path = hw/mcu/infineon/mtb-xmclib-cat3
+	url = https://github.com/Infineon/mtb-xmclib-cat3.git

hw/bsp/xmc4000/family.mk

@@ -1,7 +1,7 @@
 UF2_FAMILY_ID = 0x00
 MCU_DIR = hw/mcu/infineon/mtb-xmclib-cat3
 
-#DEPS_SUBMODULES += $(MCU_DIR)
+DEPS_SUBMODULES += $(MCU_DIR)
 
 include $(TOP)/$(BOARD_PATH)/board.mk
 

hw/mcu/infineon/mtb-xmclib-cat3

@@ -0,0 +1 @@
+Subproject commit daf5500d03cba23e68c2f241c30af79cd9d63880