bpf, arm: fix emit_ldx_r and emit_mov_i using TMP_REG_1

emit_ldx_r() and emit_a32_mov_i() were both using TMP_REG_1 and
clashing with each other. Using TMP_REG_2 in emit_ldx_r() fixes
the issue.

Fixes: ec19e02b ("ARM: net: bpf: fix LDX instructions")
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Nicolas Schichan <nschichan@freebox.fr>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

arch/arm/net/bpf_jit_32.c

@@ -915,7 +915,7 @@ static inline void emit_str_r(const u8 dst, const u8 src, bool dstk,
 /* dst = *(size*)(src + off) */
 static inline void emit_ldx_r(const u8 dst[], const u8 src, bool dstk,
 			      s32 off, struct jit_ctx *ctx, const u8 sz){
-	const u8 *tmp = bpf2a32[TMP_REG_1];
+	const u8 *tmp = bpf2a32[TMP_REG_2];
 	const u8 *rd = dstk ? tmp : dst;
 	u8 rm = src;
 	s32 off_max;