Declare const ptr() method as const and remove explcit types in casts

Signed-off-by: Daniel Egger <[email protected]>

Author: therealprof

src/generate/peripheral.rs

@@ -54,7 +54,7 @@ pub fn render(
 
         impl #name_pc {
             /// Returns a pointer to the register block
-            pub fn ptr() -> *const #base::RegisterBlock {
+            pub const fn ptr() -> *const #base::RegisterBlock {
                 #address as *const _
             }
         }