[PATCH] riscv: fix -Wundef warning for CONFIG_RISCV_BOOT_SPINWAIT

[patchwork-bot+linux-riscv at kernel.org]

Hello:

This patch was applied to riscv/linux.git (fixes)
by Palmer Dabbelt <palmer at rivosinc.com>:

On Sat,  7 Jan 2023 01:12:13 +0900 you wrote:
> Since commit 80b6093b55e3 ("kbuild: add -Wundef to KBUILD_CPPFLAGS
> for W=1 builds"), building with W=1 detects misuse of #if.
> 
>   $ make W=1 ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- arch/riscv/kernel/
>     [snip]
>     AS      arch/riscv/kernel/head.o
>   arch/riscv/kernel/head.S:329:5: warning: "CONFIG_RISCV_BOOT_SPINWAIT" is not defined, evaluates to 0 [-Wundef]
>     329 | #if CONFIG_RISCV_BOOT_SPINWAIT
>         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> [...]

Here is the summary with links:
  - riscv: fix -Wundef warning for CONFIG_RISCV_BOOT_SPINWAIT
    https://git.kernel.org/riscv/c/5b89c6f9b2df

You are awesome, thank you!
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