target/ppc: Fix build warnings when building with 'disable-tcg'

Kowshik reported that building qemu with GCC 12.2.1 for 'ppc64-softmmu'
target is failing due to following build warnings:

<snip>
 ../target/ppc/cpu_init.c:7018:13: error: 'ppc_restore_state_to_opc' defined but not used [-Werror=unused-function]
 7018 | static void ppc_restore_state_to_opc(CPUState *cs,
<snip>

Fix this by wrapping these function definitions in 'ifdef CONFIG_TCG' so that
they are only defined if qemu is compiled with '--enable-tcg'

Reported-by: Kowshik Jois B S <kowsjois@linux.ibm.com>
Fixes: 61bd1d2 ("target/ppc: Convert to tcg_ops restore_state_to_opc")
Fixes: 670f1da ("target/ppc: Implement hashst and hashchk")
Fixes: 53ae2ae ("target/ppc: Implement hashstp and hashchkp")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1319
Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Kowshik Jois B S <kowsjois@linux.vnet.ibm.com>
Message-Id: <20221116131743.658708-1-vaibhav@linux.ibm.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

target/ppc/cpu_init.c

@@ -7015,6 +7015,7 @@ static vaddr ppc_cpu_get_pc(CPUState *cs)
     return cpu->env.nip;
 }
 
+#ifdef CONFIG_TCG
 static void ppc_restore_state_to_opc(CPUState *cs,
                                      const TranslationBlock *tb,
                                      const uint64_t *data)
@@ -7023,6 +7024,7 @@ static void ppc_restore_state_to_opc(CPUState *cs,
 
     cpu->env.nip = data[0];
 }
+#endif /* CONFIG_TCG */
 
 static bool ppc_cpu_has_work(CPUState *cs)
 {

target/ppc/excp_helper.c

@@ -2842,6 +2842,7 @@ void helper_td(CPUPPCState *env, target_ulong arg1, target_ulong arg2,
 #endif
 #endif
 
+#ifdef CONFIG_TCG
 static uint32_t helper_SIMON_LIKE_32_64(uint32_t x, uint64_t key, uint32_t lane)
 {
     const uint16_t c = 0xfffc;
@@ -2924,6 +2925,7 @@ HELPER_HASH(HASHST, env->spr[SPR_HASHKEYR], true)
 HELPER_HASH(HASHCHK, env->spr[SPR_HASHKEYR], false)
 HELPER_HASH(HASHSTP, env->spr[SPR_HASHPKEYR], true)
 HELPER_HASH(HASHCHKP, env->spr[SPR_HASHPKEYR], false)
+#endif /* CONFIG_TCG */
 
 #if !defined(CONFIG_USER_ONLY)