riscv: Explicitly specify the build id style in vDSO Makefile again

riscv: Explicitly specify the build id style in vDSO Makefile again

Commit bde42e887629 ("kbuild: explicitly specify the build id style")
explicitly set the build ID style to SHA1. Commit fe806a8ced95 ("RISC-V:
Fix the VDSO symbol generaton for binutils-2.35+") undid this change,
likely unintentionally.

Restore it so that the build ID style stays consistent across the tree
regardless of linker.

Fixes: fe806a8ced95 ("RISC-V: Fix the VDSO symbol generaton for binutils-2.35+")
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Bill Wendling <morbo@google.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>