memory: emif: Simplify code handling CONFIG_OF

The first thing that of_get_memory_device_details() does is calling
of_parse_phandle(). With CONFIG_OF=n this returns NULL in a static
inline function. So the compiler can determine that
of_get_memory_device_details() also returns NULL. bloat-o-meter confirms
that this patch has no effects on the size of the generated code for
CONFIG_OF=n builds.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/9d53683c34a730c8579a1468b643b11d1379106e.1702829744.git.u.kleine-koenig@pengutronix.deSigned-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

drivers/memory/emif.c

@@ -826,7 +826,6 @@ static int is_custom_config_valid(struct emif_custom_configs *cust_cfgs,
 	return valid;
 }
 
-#if defined(CONFIG_OF)
 static void __init_or_module of_get_custom_configs(struct device_node *np_emif,
 		struct emif_data *emif)
 {
@@ -983,15 +982,6 @@ static struct emif_data * __init_or_module of_get_memory_device_details(
 	return emif;
 }
 
-#else
-
-static struct emif_data * __init_or_module of_get_memory_device_details(
-		struct device_node *np_emif, struct device *dev)
-{
-	return NULL;
-}
-#endif
-
 static struct emif_data *__init_or_module get_device_details(
 		struct platform_device *pdev)
 {