HAP: Add hardware capability check for 2MB super page.

HAP: Add hardware capability check for 2MB super page.

While setting the HAP entry previously, we only check the hardware
capability for 1GB super page. This patch adds hardware capability
check for 2MB superpage

Also, Intel SDM doesn't exclude 1GB feature for 32/pae
host. Therefore remove the BUG_ON() check in common code.

Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>