kasan: inline kasan_reset_tag for tag-based modes

Using kasan_reset_tag() currently results in a function call. As it's
called quite often from the allocator code this leads to a noticeable
slowdown. Move it to include/linux/kasan.h and turn it into a static
inline function.

Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Link: https://linux-review.googlesource.com/id/I4d2061acfe91d480a75df00b07c22d8494ef14b5