mips, bpf: Fix reference to non-existing Kconfig symbol

The Kconfig symbol for R10000 ll/sc errata workaround in the MIPS JIT was
misspelled, causing the workaround to not take effect when enabled.

Fixes: 72570224 ("mips, bpf: Add JIT workarounds for CPU errata")
Reported-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20211130160824.3781635-1-johan.almbladh@anyfinetworks.com