target/mips: Add CP0 Config2 to DisasContext

Add field corresponding to CP0 Config2 to DisasContext. This is
needed for availability control via Config2 bits.

Reviewed-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Stefan Markovic <smarkovic@wavecomp.com>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>

target/mips/translate.c

@@ -1988,6 +1988,7 @@ typedef struct DisasContext {
     uint32_t opcode;
     uint64_t insn_flags;
     int32_t CP0_Config1;
+    int32_t CP0_Config2;
     int32_t CP0_Config3;
     int32_t CP0_Config5;
     /* Routine used to access memory */
@@ -25835,6 +25836,7 @@ static void mips_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
     ctx->saved_pc = -1;
     ctx->insn_flags = env->insn_flags;
     ctx->CP0_Config1 = env->CP0_Config1;
+    ctx->CP0_Config2 = env->CP0_Config2;
     ctx->CP0_Config3 = env->CP0_Config3;
     ctx->CP0_Config5 = env->CP0_Config5;
     ctx->btarget = 0;