Enabled some modes for SVTTestRepo/XML tests

[AshithaVijay]

Some of the modes where disabled in ottawa.csv which caused some XML test to get skipped. To execute the required tests, below modes where enabled in respective platform:

aix_ppc-32	linux_ppc-32	linux_x86-32	linux_ppcle-64_ncr	linux_ppc-64_le	linux_390-31	zos_390-31
500	500	500	500	500	503	503
501	501	501			505	505
503	503	503			506	551
505	505	505			551	555
506	506	551			555	556
551	551	554			556
554	555	556			557
555	554	615			610
556	556	506
557	557	555
610	610	557
615	615	610

[llxia]

@AshithaVijay @varshm16 and @Edith-Mercy, could you work with each other? You are providing similar PRs.

Related PRs:
#527
#459

Also, reiterate #527 (comment)

I would prefer to be cautious when merging changes in ottawa.csv, as it's difficult to discern what has been altered in the file. Please list which mode on which platform has changed, and why.

Also, please do full testing with the Semeru build.