arm: Handle KCOV __init vs inline mismatches

arm: Handle KCOV __init vs inline mismatches

When KCOV is enabled all functions get instrumented, unless
the __no_sanitize_coverage attribute is used. To prepare for
__no_sanitize_coverage being applied to __init functions, we have to
handle differences in how GCC's inline optimizations get resolved. For
arm this exposed several places where __init annotations were missing
but ended up being "accidentally correct". Fix these cases and force
several functions to be inline with __always_inline.

Acked-by: Nishanth Menon <nm@ti.com>
Acked-by: Lee Jones <lee@kernel.org>
Reviewed-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/20250717232519.2984886-5-kees@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>