Add __KERNEL_DIV_ROUND_UP() macro

The latest virtio_pci.h header from Linux-6.13 kernel requires
__KERNEL_DIV_ROUND_UP() macro so define it conditionally in
linux/kernel.h.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Link: https://lore.kernel.org/r/20250127132424.339957-3-apatel@ventanamicro.com


Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Steven Price <steven.price@arm.com>