hv: remove de-privilege boot mode support and remove vboot wrappers

Now ACRN supports direct boot mode, which could be SBL/ABL, or GRUB boot.
Thus the vboot wrapper layer can be removed and the direct boot functions
don't need to be wrapped in direct_boot.c:

- remove call to init_vboot(), and call e820_alloc_memory() directly at the
  time when the trampoline buffer is actually needed.
- Similarly, call CPU_IRQ_ENABLE() instead of the wrapper init_vboot_irq().
- remove get_ap_trampoline_buf(), since the existing function
  get_trampoline_start16_paddr() returns the exact same value.
- merge init_general_vm_boot_info() into init_vm_boot_info().
- remove vm_sw_loader pointer, and call direct_boot_sw_loader() directly.
- move get_rsdp_ptr() from vboot_wrapper.c to multiboot.c, and remove the
  wrapper over two boot modes.

Tracked-On: #5197
Signed-off-by: Zide Chen <zide.chen@intel.com>

hypervisor/arch/x86/guest/vm.c

@@ -25,7 +25,6 @@
 #include <mmu.h>
 #include <logmsg.h>
 #include <vboot_info.h>
-#include <vboot.h>
 #include <board.h>
 #include <sgx.h>
 #include <sbuf.h>
@@ -33,11 +32,10 @@
 #include <vacpi.h>
 #include <platform_caps.h>
 #include <mmio_dev.h>
+#include <trampoline.h>
 #include <assign.h>
 #include <vgpio.h>
 
-vm_sw_loader_t vm_sw_loader;
-
 /* Local variables */
 
 static struct acrn_vm vm_array[CONFIG_MAX_VM_NUM] __aligned(PAGE_SIZE);
@@ -349,12 +347,9 @@ static void prepare_sos_vm_memmap(struct acrn_vm *vm)
 	}
 
 	/* unmap AP trampoline code for security
-	 * 'allocate_pages()' in depri boot mode or
-	 * 'e820_alloc_memory()' in direct boot
-	 * mode will ensure the base address of tramploline
-	 * code be page-aligned.
+	 * This buffer is guaranteed to be page aligned.
 	 */
-	ept_del_mr(vm, pml4_page, get_ap_trampoline_buf(), CONFIG_LOW_RAM_SIZE);
+	ept_del_mr(vm, pml4_page, get_trampoline_start16_paddr(), CONFIG_LOW_RAM_SIZE);
 
 	/* unmap PCIe MMCONFIG region since it's owned by hypervisor */
 	pci_mmcfg = get_mmcfg_region();