kernel: bump 6.18 to 6.18.32

kernel: bump 6.18 to 6.18.32

Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.18.32

Manually refreshed[1]:
  starfive/patches-6.18/0020-spi-pl022-starfive-Add-platform-bus-register-to-adap.patch
  starfive/patches-6.18/0022-spi-pl022-starfive-fix-the-problem-of-spi-overlay-re.patch
  starfive/patches-6.18/0031-spi-pl022-starfive-fix-controller-deregistration.patch

No patches automatically rebased via update_kernel.sh

Build system: x86/64
Build-tested: x86/64-glibc
Run-tested: x86/64-glibc

1. https://github.com/ngc7331/openwrt/commit/72360971c18d29b069871f744067e53ca51541ce

Co-authored-by: Zhihao Xu <ngc7331@outlook.com>
Signed-off-by: John Audia <therealgraysky@proton.me>
Link: https://github.com/openwrt/openwrt/pull/23419
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>