[DECNET]: Convert rwlock to spinlock
[DECNET]: Convert rwlock to spinlock

As per Stephen Hemminger's recent patch to ipv4/fib_semantics.c this
is the same change but for DECnet.

Signed-off-by: Steven Whitehouse <9ce5770b3bb4b2a1d59be2d97e34379cd192299f@chygwyn.com>
Signed-off-by: David S. Miller <fe08d3c717adf2ae63592e4c9aec6e3e404d8e3e@davemloft.net>

KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs