Update SDK submodule to 2021-04 (#122)

* AI87: Change CNN power down sequence
* Update SDK

Author: Robert Muchsel

izer/toplevel.py

@@ -720,9 +720,9 @@ def main(
                             '  MXC_SYS_ClockDisable(MXC_SYS_PERIPH_CLOCK_CNN);\n\n')
             mfile.write('  // Disable power to CNN\n')
             mfile.write(f'  MXC_{bbfc}->reg3 = 0xf; // Reset\n')
-            mfile.write(f'  MXC_{bbfc}->reg1 = 0x0; // Mask memory\n')
-            mfile.write(f'  MXC_{bbfc}->reg0 = 0x0; // Power\n')
             mfile.write(f'  MXC_{bbfc}->reg2 = 0xf; // Iso\n')
+            mfile.write(f'  MXC_{bbfc}->reg0 = 0x0; // Power\n')
+            mfile.write(f'  MXC_{bbfc}->reg1 = 0x0; // Mask memory\n')
             mfile.write(f'  MXC_{bbfc}->reg3 = 0x0; // Reset\n')
 
             if embedded_code and apifile is not None: