target/arm: make arm_casq_ptw CONFIG_TCG only

The ptw code is accessed by non-TCG code (specifically arm_pamax and
arm_cpu_get_phys_page_attrs_debug) but most of it is really only for
TCG emulation. Seeing as we already assert for a non TARGET_AARCH64
build lets extend the test rather than further messing with the ifdef
ladder.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230630180423.558337-19-alex.bennee@linaro.org>

target/arm/ptw.c

@@ -628,7 +628,7 @@ static uint64_t arm_casq_ptw(CPUARMState *env, uint64_t old_val,
                              uint64_t new_val, S1Translate *ptw,
                              ARMMMUFaultInfo *fi)
 {
-#ifdef TARGET_AARCH64
+#if defined(TARGET_AARCH64) && defined(CONFIG_TCG)
     uint64_t cur_val;
     void *host = ptw->out_host;
 
@@ -709,7 +709,7 @@ static uint64_t arm_casq_ptw(CPUARMState *env, uint64_t old_val,
 
     return cur_val;
 #else
-    /* AArch32 does not have FEAT_HADFS. */
+    /* AArch32 does not have FEAT_HADFS; non-TCG guests only use debug-mode. */
     g_assert_not_reached();
 #endif
 }