kprobe/static_call: Restore missing static_call_text_reserved()

Restore two hunks from commit:

  6333e8f7 ("static_call: Avoid kprobes on inline static_call()s")

that went walkabout in a Git merge commit.

Fixes: 76d4acf2

 ("Merge tag 'perf-kprobes-2020-12-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Link: https://lore.kernel.org/r/20210628113045.167127609@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>