ARM: p2v: drop redundant 'type' argument from __pv_stub

We always pass the same value for 'type' so pull it into the __pv_stub
macro itself.

Acked-by: Nicolas Pitre <nico@fluxnic.net>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>