ARM: 8380/1: bpf: fix NOMMU build

arch/arm/net/built-in.o: In function `bpf_jit_compile':
:(.text+0x2758): undefined reference to `set_memory_ro'
arch/arm/net/built-in.o: In function `bpf_jit_free':
:(.text+0x27ac): undefined reference to `set_memory_rw'

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>