drm/vmwgfx: Remove duplicate vmwgfx_vkms.h header

./drivers/gpu/drm/vmwgfx/vmwgfx_vkms.c: vmwgfx_vkms.h is included more than once.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=8772


Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Zack Rusin <zack.rusin@broadcom.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240417012917.66046-1-jiapeng.chong@linux.alibaba.com