soc/integration/soc: Move adding constant for identifier directly to add_identifier method.

litex/soc/integration/soc.py

@@ -1473,6 +1473,7 @@ class LiteXSoC(SoC):
         else:
             self.add_config("BIOS_NO_BUILD_TIME")
         self.add_module(name=name, module=Identifier(identifier))
+        self.add_constant(name, identifier)
 
     # Add UART -------------------------------------------------------------------------------------
     def add_uart(self, name="uart", uart_name="serial", baudrate=115200, fifo_depth=16):

litex/soc/integration/soc_core.py

@@ -247,7 +247,6 @@ class SoCCore(LiteXSoC):
         # Add Identifier.
         if ident != "":
             self.add_identifier("identifier", identifier=ident, with_build_time=ident_version)
-            self.add_constant("identifier", ident)
 
         # Add UARTBone.
         if with_uartbone: