mmc: sdhci-of-arasan: Change code style of mapping the syscon field

Change code style of mapping the syscon in sdhci_arasan_update_support64b()
for readability and consistency.

Signed-off-by: Muhammad Husaini Zulkifli <[e-mail]>
Acked-by: Andy Shevchenko <[e-mail]>
Acked-by: Adrian Hunter <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/host/sdhci-of-arasan.c

···
 {
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
-	const struct sdhci_arasan_soc_ctl_map *soc_ctl_map =
-		sdhci_arasan->soc_ctl_map;
+	const struct sdhci_arasan_soc_ctl_map *soc_ctl_map;
 
 	/* Having a map is optional */
+	soc_ctl_map = sdhci_arasan->soc_ctl_map;
 	if (!soc_ctl_map)
 		return;