av1parser: Fix array sizes in scalability structure

av1parser: Fix array sizes in scalability structure

Since the AV1 specification is not explicitly mentioning about
the array size bounds, array sizes in scalability structure
should be defined as possible maximum sizes that can have.

Also, this commit removes GST_AV1_MAX_SPATIAL_LAYERS define from
public header which is API break but the define is misleading
and this patch is introducing ABI break already

ZDI-CAN-22300

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5824>