[PATCH] ARM64: Add back and fix support for CMDLINE_EXTEND

[Russell King (Oracle)]

On Fri, Mar 28, 2025 at 10:22:34AM +0000, Yeking at Red54.com wrote:
> From: 谢致邦 (XIE Zhibang) <Yeking at Red54.com>
> 
> After commit e6384c398459 ("efi/libstub: Parse builtin command line
> after bootloader provided one"), the behavior of EFI has been consistent
> with FDT.
> 
> So add back and fix support for CMDLINE_EXTEND.
> 
> Fixes: cae118b6acc3 ("arm64: Drop support for CMDLINE_EXTEND")
> Signed-off-by: 谢致邦 (XIE Zhibang) <Yeking at Red54.com>

This breaks the ability for the user (via the boot loader) to override
built-in arguments.

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