refactor(csec): take ownership of FTFC and CSE_PRAM

This simplifies usage with RTFM.

src/csec.rs

@@ -208,9 +208,9 @@ fn u8_be_array_from_u32(x: u32) -> [u8; 4] {
     ]
 }
 
-pub struct CSEc<'a> {
-    ftfc: &'a s32k144::FTFC,
-    cse_pram: &'a s32k144::CSE_PRAM,
+pub struct CSEc {
+    ftfc:  s32k144::FTFC,
+    cse_pram:  s32k144::CSE_PRAM,
 }
 
 const PAGE_1_OFFSET: usize = 16;
@@ -225,10 +225,10 @@ const UPPER_HALF_SHIFT: u32 = 0x10;
 const BYTES_TO_PAGES_SHIFT: u32 = 4;
 const MAX_PAGES: usize = 7;
 
-impl<'a> CSEc<'a> {
+impl CSEc {
     pub fn init(
-        ftfc: &'a s32k144::FTFC,
-        cse_pram: &'a s32k144::CSE_PRAM,
+        ftfc: s32k144::FTFC,
+        cse_pram: s32k144::CSE_PRAM,
     ) -> Self {
         CSEc {
             ftfc: ftfc,