imx: imx8: fix build when CONFIG_IMX_BOOTAUX is set

Use correct function name.

Fixes: e8cd1f60d964 ("imx: imx8: bootaux: Add i.MX8 M4 boot support")
Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
diff --git a/arch/arm/mach-imx/imx8/cpu.c b/arch/arm/mach-imx/imx8/cpu.c
index accba50..834aca8 100644
--- a/arch/arm/mach-imx/imx8/cpu.c
+++ b/arch/arm/mach-imx/imx8/cpu.c
@@ -258,14 +258,14 @@
 			return -EIO;
 		}
 
-		if (!power_domain_lookup_name("audio_sai0", &pd)) {
+		if (!imx8_power_domain_lookup_name("audio_sai0", &pd)) {
 			if (power_domain_on(&pd)) {
 				printf("Error power on SAI0\n");
 				return -EIO;
 			}
 		}
 
-		if (!power_domain_lookup_name("audio_ocram", &pd)) {
+		if (!imx8_power_domain_lookup_name("audio_ocram", &pd)) {
 			if (power_domain_on(&pd)) {
 				printf("Error power on HIFI RAM\n");
 				return -EIO;