x86inc: Make ym# behave the same way as xm#

This makes more sense for future implementations of templates with zmm registers.

Signed-off-by: Diego Biurrun <diego@biurrun.de>
x86inc: Free up variable name "n" in global namespace

Signed-off-by: Diego Biurrun <diego@biurrun.de>
x86inc: Make INIT_CPUFLAGS support an arbitrary number of cpuflags

Previously there was a limit of two cpuflags.

Signed-off-by: Diego Biurrun <diego@biurrun.de>