Update BSP source files for UltraScale Cortex-A53 and Cortex-R5 and Microblaze to...

Update BSP source files for UltraScale Cortex-A53 and Cortex-R5 and Microblaze to the 2016.4 versions.
Correct alignment issue in GCC Cortex-R port that was preventing full floating point usage in interrupts (other ports will be updated likewise).
Update the UltraScale R5 demo to test the GCC Cortex-A9 port layer modification mentioned on the line above.