Add a new x86(_64) arch variant "goldmont-without-xsaves"

Its target arch is goldmont, but without xsaves support.
It can build images that run on old Intel/AMD CPUs as well as new CPUs.

Bug: 314243939
Test: Build an image with TARGET_ARCH_VARIANT:=goldmont-without-xsaves
Change-Id: I9c4bfd3928511f5b4a075f9a9337db6e1270a765