The current code use VM number to calculate HV_RAM_SIZE, this is not
match the HV logic.
This patch use the max number of trusty VMs to calculate the size of
sworld memory and assume 4M ram / VM to calculate the final ACRN ram
size.
Tracked-On: #6690
Signed-off-by: Chenli Wei <chenli.wei@intel.com>
Reviewed-by: Junjie Mao <junjie.mao@intel.com>