redhat: drop unneeded build-time dependency gcc-plugin-devel
gcc-plugin-devel was added as a build-time dependency because CONFIG_GCC_PLUGINS was enabled in commit 4f367b12 ("redhat/configs: Enable CONFIG_GCC_PLUGINS on ARK").
Later commit a310e189 ("redhat/configs: Disable CONFIG_GCC_PLUGINS") disabled CONFIG_GCC_PLUGINS, thus gcc-plugin-devel is no longer needed for building the kernel.
Fixes: a310e189 ("redhat/configs: Disable CONFIG_GCC_PLUGINS") Signed-off-by: Coiby Xu coxu@redhat.com