stm32: Add STM32 USB TCPC Driver

This commit adds a USB Type-C Port Controller Driver for
the STM32 USB Type-C / USB Power Delivery (UCPD) peripheral

Signed-off-by: Sam Hurst <sbh1187@gmail.com>
diff --git a/drivers/CMakeLists.txt b/drivers/CMakeLists.txt
index 83f4d95..0aafe63 100644
--- a/drivers/CMakeLists.txt
+++ b/drivers/CMakeLists.txt
@@ -7,6 +7,7 @@
 add_subdirectory(pcie)
 add_subdirectory(disk)
 add_subdirectory(usb)
+add_subdirectory(usbc)
 
 add_subdirectory_ifdef(CONFIG_ADC adc)
 add_subdirectory_ifdef(CONFIG_CLOCK_CONTROL clock_control)