net: ipa: don't configure IDLE_INDICATION on v3.1

IPA v3.1 doesn't support the IDLE_INDICATION_CFG register, this was
causing a harmless splat in ipa_idle_indication_cfg(), add a version
check to prevent trying to fetch this register on v3.1

Fixes: 6a244b75 ("net: ipa: introduce ipa_reg()")
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Tested-by: Jami Kettunen <jami.kettunen@somainline.org>
Link: https://lore.kernel.org/r/20221024234850.4049778-1-caleb.connolly@linaro.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ipa/ipa_main.c

@@ -434,6 +434,9 @@ static void ipa_idle_indication_cfg(struct ipa *ipa,
 	const struct ipa_reg *reg;
 	u32 val;
 
+	if (ipa->version < IPA_VERSION_3_5_1)
+		return;
+
 	reg = ipa_reg(ipa, IDLE_INDICATION_CFG);
 	val = ipa_reg_encode(reg, ENTER_IDLE_DEBOUNCE_THRESH,
 			     enter_idle_debounce_thresh);