x86/percpu: Disable named address spaces for UBSAN_BOOL with KASAN for GCC < 14.2

GCC < 14.2 does not correctly propagate address space qualifiers
with -fsanitize=bool,enum. Together with address sanitizer then
causes that load to be sanitized.

Disable named address spaces for GCC < 14.2 when both, UBSAN_BOOL
and KASAN are enabled.

Reported-by: Matt Fleming <matt@readmodwrite.com>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20250227140715.2276353-1-ubizjak@gmail.com
Closes: https://lore.kernel.org/lkml/20241213190119.3449103-1-matt@readmodwrite.com/