lantiq: vr9 fxs support: remove unused wdog declarations and initializers

modify 0152-lantiq-VPE.patch from
commit e0229a16 ("lantiq: added support for VPE1")

- remove wdog function declarations from header (asm/vpe.h)
- remove wdog command line init functions (vpe.c)

Signed-off-by: Stefan Koch <stefan.koch10@gmail.com>