For chromebooks, we need a new build variant whose target arch is
goldmont, but without SHA and XSAVES support (b/314243939#comment21)
Bug: 314243939
Test: Build an image with TARGET_ARCH_VARIANT:=goldmont-without-sha-xsaves
Change-Id: If73660b515b443d5c138ca367fa3d1c6f18485b5