Add m1n1-aurora and the silent uboot-asahi for Apple Silicon, aarch64 and edge only

Ported from the asahi-quattro lane. Both are pinned by hand like
linux-aurora and restricted to aarch64 and the edge channel from their
first merge, since merging publishes. pkgrel sits one above the fork
lanes' builds so the same filename never carries two sets of bytes.

pkgbuilds/uboot-asahi/p3450-fix-board.patch

@@ -0,0 +1,25 @@
+From c9b65320d64a60cde74c4c1f9cb4a05198a456c2 Mon Sep 17 00:00:00 2001
+From: Peter Robinson <pbrobinson@gmail.com>
+Date: Wed, 10 Sep 2025 13:27:52 +0100
+Subject: [PATCH] further size reductions
+
+---
+ configs/p3450-0000_defconfig | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/configs/p3450-0000_defconfig b/configs/p3450-0000_defconfig
+index 2ebcf8b83fc..a5e717a02ed 100644
+--- a/configs/p3450-0000_defconfig
++++ b/configs/p3450-0000_defconfig
+@@ -27,6 +27,8 @@ CONFIG_CONSOLE_MUX=y
+ CONFIG_SYS_STDIO_DEREGISTER=y
+ CONFIG_SYS_PROMPT="Tegra210 (P3450-0000) # "
+ # CONFIG_BOOTM_PLAN9 is not set
++# CONFIG_SYS_DTC_PAD_BYTES is not set
++# CONFIG_LEGACY_IMAGE_FORMAT is not set
+ # CONFIG_BOOTM_RTEMS is not set
+ # CONFIG_BOOTM_VXWORKS is not set
+ # CONFIG_CMD_ELF is not set
+-- 
+2.51.0
+