ltq-ptm: Update VR9 PTM firmware

ltq-ptm: Update VR9 PTM firmware

After looking at various vendor GPL source code dumps I discovered that some
of them contain updated versions of ltq-ptm driver when compared to what
openwrt has.

The driver update is mostly cursory (simple changes to comments, whitespace,
formatting etc.) or adds debug features not used by openwrt.

However the updated driver also contains a later version of PTM firmware which
is extracted and included in this commit along with bits to correctly identify
its version when driver loads.

Signed-off-by: Antti Seppälä <a.seppala@gmail.com>