Revert "Added support for specifing IVs other than 0"

This reverts commit 3c82082.

Author: Jakob Gerstmayer

hal/src/aes.rs

@@ -813,11 +813,6 @@ impl Aes {
 
         let keysize: KeySize = self.set_key(key);
 
-        self.aes.ivr0.write(|w| w.ivi().bits(iv[3]));
-        self.aes.ivr1.write(|w| w.ivi().bits(iv[2]));
-        self.aes.ivr2.write(|w| w.ivi().bits(iv[1]));
-        self.aes.ivr3.write(|w| w.ivi().bits(iv[0]));
-
         self.aes.cr.write(|w| {
             w.en().enabled();
             w.datatype().variant(self.swap_mode);