arm: apple: Add initial support for Apple's M1 SoC

Add support for Apple's M1 SoC that is used in "Apple Silicon"
Macs.  This builds a basic U-Boot that can be used as a payload
for the m1n1 boot loader being developed by the Asahi Linux
project.

Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
[trini: Add MAINTAINERS entry]
diff --git a/arch/arm/mach-apple/Kconfig b/arch/arm/mach-apple/Kconfig
new file mode 100644
index 0000000..66cab91
--- /dev/null
+++ b/arch/arm/mach-apple/Kconfig
@@ -0,0 +1,18 @@
+if ARCH_APPLE
+
+config SYS_TEXT_BASE
+	default 0x00000000
+
+config SYS_CONFIG_NAME
+	default "apple"
+
+config SYS_SOC
+	default "m1"
+
+config SYS_MALLOC_LEN
+	default 0x4000000
+
+config SYS_MALLOC_F_LEN
+	default 0x4000
+
+endif