xen/arm: Don't ignore the affinity level 3 in the MPIDR

xen/arm: Don't ignore the affinity level 3 in the MPIDR

Currently, Xen is considering that all the affinity bits are defined
below 32-bit. However, Arm64 define a 3rd level affinity in bits 32-39.

The function gicv3_send_sgi_list in the GICv3 driver will compute the
cluster using the following code:

uint64_t cluster_id = cpu_logical_map(cpu) & ~MPIDR_AFF0_MASK;

Because MPIDR_AFF0_MASK is defined as a 32-bit value, we will miss out
the 3rd level affinity. As a consequence, the IPI would not be sent to
the correct vCPU.

This particular error can be solved by switching MPIDR_AFF0_MASK to use
unsigned long. However, take the opportunity to switch all the MPIDR_*
define to use unsigned long to avoid anymore issue.

Signed-off-by: Wei Chen <wei.chen@arm.com>
[julien: Reword the commit message]
Reviewed-by: Julien Grall <jgrall@amazon.com>