x86: Adjust types used in port I/O helpers

Change port I/O helpers to use u8/u16/u32 instead of unsigned
char/short/int for values. Use u16 instead of int for port number.

It aligns the helpers with implementation in boot stub in preparation
for consolidation.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20220405232939.73860-14-kirill.shutemov@linux.intel.com