core: Handle lsr 32 correctly

Shifter tests from the mGBA test suite now pass with a 140/140 score.
Also fixes gba::tests::test_arm7tdmi_thumb_eggvance.

Former-commit-id: 4cd4faa3b33f04969b38480c5eed8bf352be025a
Former-commit-id: d1427d8c9b407be1505c0153cce1ecdadd646664

rustboyadvance-core/src/arm7tdmi/alu.rs

@@ -138,6 +138,10 @@ impl Core {
                     self.bs_carry_out = (val >> (amount - 1) & 1) == 1;
                     val >> amount
                 }
+                32 => {
+                    self.bs_carry_out = val.bit(31);
+                    0
+                }
                 _ => {
                     self.bs_carry_out = false;
                     0