powerpc/fsl-booke64: add missing virtualization options in defconfig

The 32-bit defconfig version has these enabled
for years so make the 64-bit defconfig have them too.
This patch only adds CONFIG_VIRT_DRIVERS,
CONFIG_FSL_HV_MANAGER and CONFIG_PPC_EPAPR_HV_BYTECHAN
other changes being "make savedefconfig" artifacts.

Signed-off-by: Laurentiu Tudor <Laurentiu.Tudor@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>