buildroot

arch: use BR2_X86_CPU_HAS_SSE4, SSE42 with jaguar

This follow-up commit adds support for SSE 4 and SSE 4.2 to
the jaguar architecture.

Signed-off-by: Adrien Béraud <adrien.beraud@savoirfairelinux.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>