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: NLukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: NJohan Almbladh <johan.almbladh@anyfinetworks.com>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20211130160824.3781635-1-johan.almbladh@anyfinetworks.com

arch/mips/net/bpf_jit_comp.h

@@ -98,7 +98,7 @@ do {								\
 #define emit(...) __emit(__VA_ARGS__)
 
 /* Workaround for R10000 ll/sc errata */
-#ifdef CONFIG_WAR_R10000
+#ifdef CONFIG_WAR_R10000_LLSC
 #define LLSC_beqz	beqzl
 #else
 #define LLSC_beqz	beqz