riscv: vdso_cfi: Add .gitignore for build artifacts

The vdso_cfi build process copies source files (*.c, *.S) from the main
vdso directory to the build directory. Without a .gitignore file, these
co

riscv: vdso_cfi: Add .gitignore for build artifacts

The vdso_cfi build process copies source files (*.c, *.S) from the main
vdso directory to the build directory. Without a .gitignore file, these
copied files appear as untracked files in git status, cluttering the
working directory.

Add a .gitignore file to exclude:
- Copied source files (*.c, *.S)
- Temporary build files (vdso.lds, *.tmp, vdso-syms.S)
- While preserving vdso-cfi.S which is the original entry point

This follows the same pattern used in the main vdso directory
and keeps the working directory clean.

Signed-off-by: Chen Pei <cp0613@linux.alibaba.com>
Link: https://patch.msgid.link/20260320021850.1877-3-cp0613@linux.alibaba.com
Signed-off-by: Paul Walmsley <pjw@kernel.org>

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riscv: vdso_cfi: Add clean rule for copied sources

When building VDSO with CFI support, source files are copied from the main
VDSO directory to the CFI build directory as part of the build process.

riscv: vdso_cfi: Add clean rule for copied sources

When building VDSO with CFI support, source files are copied from the main
VDSO directory to the CFI build directory as part of the build process.
However, these copied source files were not removed during 'make clean',
leaving temporary files in the build directory.

Add the clean-files variable to ensure that these copied .c and .S files
are properly cleaned up. The notdir() function is used to strip the path
prefix, as clean-files expects relative file names without directory
components.

This ensures the build directory is left in a clean state after make clean.

Signed-off-by: Chen Pei <cp0613@linux.alibaba.com>
Link: https://patch.msgid.link/20260320021850.1877-2-cp0613@linux.alibaba.com
Signed-off-by: Paul Walmsley <pjw@kernel.org>

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