add(build): Add initial ESP32-P4 skeleton

Chip is not selected by default and has only one memory and bootloader configuration. This is the minimum required to issue `build.sh -t esp32p4` which will currently fail, because Arduino support is not yet ready

Author: me-no-dev

configs/builds.json

@@ -44,6 +44,16 @@
 		}
 	],
 	"targets":[
+		{
+			"target": "esp32p4",
+			"skip": 1,
+			"features":[],
+			"idf_libs":["qio","80m"],
+			"bootloaders":[
+				["qio","80m"]
+			],
+			"mem_variants":[]
+		},
 		{
 			"target": "esp32c2",
 			"skip": 1,