Multigrain timestamps do not work on RISC-V

[Andreas Schwab]

The statx06 test in the LTP testsuite fails since the multigrain
timestamp feature was merged:

https://openqa.opensuse.org/tests/4800409#step/statx06/7

The issue is that the nsec part of ctime does not change from the time
the file is created:

$ touch xx
$ stat -c $'mtime %y\nctime %z' xx
mtime 2025-01-29 09:43:44.677442605 +0100
ctime 2025-01-29 09:43:44.677442605 +0100
$ touch xx
$ stat -c $'mtime %y\nctime %z' xx
mtime 2025-01-29 09:43:51.641581658 +0100
ctime 2025-01-29 09:43:51.677442605 +0100

My guess would be that something in inode_set_ctime_current is going
wrong.

-- 
Andreas Schwab, SUSE Labs, schwab at suse.de
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