[PATCH] RISC-V: fix setting up std streams in init_semihosting()

[Ram Nalamothu (QUIC)]

Without this patch, the following simple test would fail to run as expected.

#include <stdio.h>
int main() {
  int n;
  printf("Enter a number\n");
  scanf("%d", &n);
  printf("Entered number: %d\n", n);
  return 0;
}

If the patch looks good, could someone please commit it on behalf of me as I don't have commit rights.

-- 8< --

Currently init_semihosting() assumes the return value from _open()
call as the file descriptor handle and that is incorrect.

The semihost _open() call returns the fdtable index returned by the
__add_fdentry() for the file opened.
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