bug: not setting the global pointer

[duaneellissd]

in this code where is the global pointer (x3) initialized to the proper value, note zero is not correct
typically this involves the variable _global_pointer$ created by the linker

https://github.com/Xilinx/embeddedsw/blob/master/lib/bsp/standalone/src/riscv/boot.S

[anirudha1977]

We will take a look at it and if needed fix it in the next release. We have filed an internal tracker.