include/cpu/x86/tsc: Fix rdtsc on x86_64
The used assembler code only works on x86_32, but not on x86_64.
Use the inline functions to provide valid rdtsc readings on both
x86_32 and x86_64.
Tested on Lenovo T410 with additional x86_64 patches.
Change-Id: Icf706d6fb751372651e5e56d1856ddad688d9fa3
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45702
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>