jiffies: Remove unused __jiffy_arch_data

jiffies: Remove unused __jiffy_arch_data

The __jiffy_arch_data definition was added in 2017 by commit 60b0a8c3d248
("frv: declare jiffies to be located in the .data section") for the needs
of the frv port. The frv support was removed in 2018 by commit fd8773f9f544
("arch: remove frv port") and no other architecture has required
__jiffy_arch_data. Therefore, remove this unused definition.

Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260217112638.1525094-1-petr.pavlu@suse.com