Add back three registers for 7x2/7x3/730 chips

These Vref calibration and temperature sample registers do actually
exist for those chips, but aren't documented in the reference manuals
for any F7 chip.  (The registers are documented in the datasheets
instead.)

Add them back.

src/signature.rs

@@ -82,6 +82,8 @@ impl FlashSize {
 #[derive(Debug)]
 #[repr(C)]
 pub struct VrefCal(u16);
+#[cfg(any(feature = "svd-f7x2", feature = "svd-f7x3", feature = "svd-f730"))]
+define_ptr_type!(VrefCal, 0x1FF0_7A2A);
 #[cfg(not(any(feature = "svd-f7x2", feature = "svd-f7x3", feature = "svd-f730")))]
 define_ptr_type!(VrefCal, 0x1FF0_F44A);
 
@@ -96,6 +98,8 @@ impl VrefCal {
 #[derive(Debug)]
 #[repr(C)]
 pub struct VtempCal30(u16);
+#[cfg(any(feature = "svd-f7x2", feature = "svd-f7x3", feature = "svd-f730"))]
+define_ptr_type!(VtempCal30, 0x1FF0_7A2C);
 #[cfg(not(any(feature = "svd-f7x2", feature = "svd-f7x3", feature = "svd-f730")))]
 define_ptr_type!(VtempCal30, 0x1FF0_F44C);
 
@@ -110,6 +114,8 @@ impl VtempCal30 {
 #[derive(Debug)]
 #[repr(C)]
 pub struct VtempCal110(u16);
+#[cfg(any(feature = "svd-f7x2", feature = "svd-f7x3", feature = "svd-f730"))]
+define_ptr_type!(VtempCal110, 0x1FF0_7A2E);
 #[cfg(not(any(feature = "svd-f7x2", feature = "svd-f7x3", feature = "svd-f730")))]
 define_ptr_type!(VtempCal110, 0x1FF0_F44E);