riscv: module: Use generic cmp_int() instead of custom cmp_3way()

riscv: module: Use generic cmp_int() instead of custom cmp_3way()

The module-sections.c file defines a custom cmp_3way() macro to perform
3-way comparisons during relocation sorting.

Instead of maintaining our own implementation, use the generic
cmp_int() macro provided by the already included <linux/sort.h>. This
removes redundant code and relies on standard kernel interfaces.

Signed-off-by: Florian Schmaus <florian.schmaus@codasip.com>
Link: https://patch.msgid.link/20260512063231.708256-1-florian.schmaus@codasip.com
Signed-off-by: Paul Walmsley <pjw@kernel.org>