Important fix: Use bitmask everywhere now

This PAC was generated using a patched version of svd2rust with
commit hash 43be074d21132c3a76780816010df592a3603874

It includes bugfix https://github.com/rust-embedded/svd2rust/pull/549

src/sysconfig/lockup_reset.rs

@@ -67,7 +67,7 @@ impl<'a> LREN_W<'a> {
     #[doc = r"Writes raw bits to the field"]
     #[inline(always)]
     pub fn bit(self, value: bool) -> &'a mut W {
-        self.w.bits = value as u32;
+        self.w.bits = (self.w.bits & !0x01) | (value as u32 & 0x01);
         self.w
     }
 }
@@ -75,7 +75,7 @@ impl R {
     #[doc = "Bit 0 - Lockup Reset Enable Bit"]
     #[inline(always)]
     pub fn lren(&self) -> LREN_R {
-        LREN_R::new(self.bits != 0)
+        LREN_R::new((self.bits & 0x01) != 0)
     }
 }
 impl W {