x86/alternatives: Rename 'struct bp_patching_desc' to 'struct text_poke_int3_vec'

x86/alternatives: Rename 'struct bp_patching_desc' to 'struct text_poke_int3_vec'

Follow the INT3 text-poking nomenclature, and also adopt the
'vector' name for the entire object, instead of the rather
opaque 'descriptor' naming.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Juergen Gross <jgross@suse.com>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250411054105.2341982-4-mingo@kernel.org