KVM: arm64: selftests: Track width of timer counter as "int", not "uint64_t"

KVM: arm64: selftests: Track width of timer counter as "int", not "uint64_t"

Store the width of arm64's timer counter as an "int", not a "uint64_t".
ilog2() returns an "int", and more importantly using what is an "unsigned
long" under the hood makes clang unhappy due to a type mismatch when
clamping the width to a sane value.

  arm64/arch_timer_edge_cases.c:1032:10: error: comparison of distinct pointer types
     ('typeof (width) *' (aka 'unsigned long *') and 'typeof (56) *' (aka 'int *'))
     [-Werror,-Wcompare-distinct-pointer-types]
   1032 |         width = clamp(width, 56, 64);
        |                 ^~~~~~~~~~~~~~~~~~~~
  tools/include/linux/kernel.h:47:45: note: expanded from macro 'clamp'
     47 | #define clamp(val, lo, hi)      min((typeof(val))max(val, lo), hi)
        |                                                  ^~~~~~~~~~~~
  tools/include/linux/kernel.h:33:17: note: expanded from macro 'max'
     33 |         (void) (&_max1 == &_max2);              \
        |                 ~~~~~~ ^  ~~~~~~
  tools/include/linux/kernel.h:39:9: note: expanded from macro 'min'
     39 |         typeof(x) _min1 = (x);                  \
        |                ^

Fixes: fad4cf944839 ("KVM: arm64: selftests: Determine effective counter width in arch_timer_edge_cases")
Cc: Sebastian Ott <sebott@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>