Change all assert(0) to BUG()

I would like to make assertions evaluate at compile time where possible,
but sometimes people used a literal assert(0) to force an assertion in a
certain code path. We already have BUG() for that so let's just replace
those instances with that.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I674e5f8ec7f5fe8b92b1c7c95d9f9202d422ce32
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44047
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/southbridge/amd/pi/hudson/early_setup.c

@@ -187,7 +187,7 @@ static void lpc_wideio_window(uint16_t base, uint16_t size)
 			pci_write_config32(dev, LPC_WIDEIO2_GENERIC_PORT, tmp);
 			enable_wideio(2, size);
 		} else {	/* All WIDEIO locations used*/
-			assert(0);
+			BUG();
 		}
 	}
 }