scripts: headers_install.sh: Normalize __ASSEMBLER__ to __ASSEMBLY__

There is an ongoing effort to replace the usage of __ASSEMBLY__ with
__ASSEMBLER__ throughout the kernel tree, see for example
commit 287d163322b7 ("arm64: Replace __ASSEMBLY__ with __ASSEMBLER__ in
non-uapi headers"). The latter is automatically provided by all compilers
and preprocessors supported by the kernel, so the explicit definitions
of __ASSEMBLY__ can be removed.

However the UAPI headers might be used with non-GCC-compatible
compilers, which do not define __ASSEMBLER__ automatically.
So this migration may break users. Also during the migration phase, the
UAPI headers will use a mix of *both* __ASSEMBLY__ and __ASSEMBLER__ at
the same time, which is ugly and inconsistent.

For now make sure that the exported UAPI headers consistently use
__ASSEMBLY__ as before.

Link: https://lore.kernel.org/lkml/164baf81-2824-4943-bbc1-4ae8a160c0cc@t-8ch.de/
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Nick Huang <sef1548@gmail.com>
Reviewed-by: Nicolas Schier <n.schier@fritz.com>
Tested-by: Nicolas Schier <n.schier@fritz.com>
Link: https://patch.msgid.link/20260630-uapi-assembly-v2-1-8e7bee2fe816@weissschuh.net
Signed-off-by: Nicolas Schier <nsc@kernel.org>

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