arm: dts: imx8m: Require ATF BL31 blob only if not PSCI provider

In case U-Boot itself if the PSCI provider on i.MX8M, do not
require the ATF BL31 blob, as at that point the blob is useless
and would interfere with U-Boot operation.

Signed-off-by: Marek Vasut <marex@denx.de>
diff --git a/arch/arm/dts/imx8mn-u-boot.dtsi b/arch/arm/dts/imx8mn-u-boot.dtsi
index ec53390..d55dddb 100644
--- a/arch/arm/dts/imx8mn-u-boot.dtsi
+++ b/arch/arm/dts/imx8mn-u-boot.dtsi
@@ -163,6 +163,7 @@
 					};
 				};
 
+#ifndef CONFIG_ARMV8_PSCI
 				atf {
 					arch = "arm64";
 					compression = "none";
@@ -176,6 +177,7 @@
 						type = "atf-bl31";
 					};
 				};
+#endif
 
 				binman_fip: fip {
 					arch = "arm64";
@@ -204,7 +206,9 @@
 					description = "NAME";
 					fdt = "fdt-SEQ";
 					firmware = "uboot";
+#ifndef CONFIG_ARMV8_PSCI
 					loadables = "atf";
+#endif
 				};
 			};
 		};