Revert definition of SIE_STATUS.SUSPENDED

Writing the SUSPENDED bit does not clear the bit itself. Instead,
it clears the DEV_SUSPENDED bit of the INTR register.

While oneToClear is not completely accurate, it's still better than read-only.

svd/rp2040.yaml

@@ -693,6 +693,10 @@ USBCTRL_REGS:
       J: [1, "J"]
       K: [2, "K"]
       SE1: [3, "SE1"]
+    _modify:
+      SUSPENDED:
+        access: read-write
+        modifiedWriteValues: oneToClear
 
   # The ADDR_ENDP* registers collected into the array HOST_ADDR_ENDP.
   # This renaming is necessary to avoid collision with the "ADDR_ENDP" register used in device mode.