x86/cpu: Prefix hexadecimal values with 0x in cpu_debug_show()

The hex values in CPU debug interface are not prefixed with 0x. This may
cause misinterpretation of values. Fix it.

[ mingo: Restore previous vertical alignment of the output. ]

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/r/20241211-add-cpu-type-v5-1-2ae010f50370@linux.intel.com