arch: arm: dts: k3-am625-phycore-som-binman: Add custMpk to overlays

There are some device-tree overlays with missing entries for the
keyfile. Add them to sign all images in the U-Boot FIT image.

Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
Reviewed-by: Wadim Egorov <w.egorov@phytec.de>
diff --git a/arch/arm/dts/k3-am625-phycore-som-binman.dtsi b/arch/arm/dts/k3-am625-phycore-som-binman.dtsi
index 31456d2..4a65427 100644
--- a/arch/arm/dts/k3-am625-phycore-som-binman.dtsi
+++ b/arch/arm/dts/k3-am625-phycore-som-binman.dtsi
@@ -321,8 +321,11 @@
 					compression = "none";
 					load = <0x8F000000>;
 					arch = "arm";
-
-					blob-ext {
+					ti-secure {
+						content = <&am6xx_phycore_disable_rtc_dtbo>;
+						keyfile = "custMpk.pem";
+					};
+					am6xx_phycore_disable_rtc_dtbo: blob-ext {
 						filename = "dts/upstream/src/arm64/ti/k3-am6xx-phycore-disable-rtc.dtbo";
 					};
 				};
@@ -333,8 +336,11 @@
 					compression = "none";
 					load = <0x8F001000>;
 					arch = "arm";
-
-					blob-ext {
+					ti-secure {
+						content = <&am6xx_phycore_disable_spi_not_dtbo>;
+						keyfile = "custMpk.pem";
+					};
+					am6xx_phycore_disable_spi_not_dtbo: blob-ext {
 						filename = "dts/upstream/src/arm64/ti/k3-am6xx-phycore-disable-spi-nor.dtbo";
 					};
 				};
@@ -345,8 +351,11 @@
 					compression = "none";
 					load = <0x8F002000>;
 					arch = "arm";
-
-					blob-ext {
+					ti-secure {
+						content = <&am6xx_phycore_disable_eth_phy_dtbo>;
+						keyfile = "custMpk.pem";
+					};
+					am6xx_phycore_disable_eth_phy_dtbo: blob-ext {
 						filename = "dts/upstream/src/arm64/ti/k3-am6xx-phycore-disable-eth-phy.dtbo";
 					};
 				};
@@ -357,8 +366,11 @@
 					compression = "none";
 					load = <0x8F003000>;
 					arch = "arm";
-
-					blob-ext {
+					ti-secure {
+						content = <&am6xx_phycore_disable_qspi_nor_dtbo>;
+						keyfile = "custMpk.pem";
+					};
+					am6xx_phycore_disable_qspi_nor_dtbo: blob-ext {
 						filename = "dts/upstream/src/arm64/ti/k3-am6xx-phycore-qspi-nor.dtbo";
 					};
 				};