hv: move boot/multiboot.c to boot/sbl/multiboot.c

boot/multiboot.c is only used by SBL. So move it to boot/sbl.

Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
Acked-by: Eddie Dong <Eddie.dong@intel.com>

hypervisor/Makefile

@@ -80,7 +80,6 @@ OBJCOPY ?= objcopy
 D_SRCS += $(wildcard debug/*.c)
 C_SRCS += boot/acpi.c
 C_SRCS += boot/dmar_parse.c
-C_SRCS += boot/multiboot.c
 C_SRCS += arch/x86/ioapic.c
 C_SRCS += arch/x86/intr_lapic.c
 S_SRCS += arch/x86/cpu_secondary.S
@@ -142,6 +141,10 @@ C_SRCS += bsp/$(PLATFORM)/$(PLATFORM).c
 
 ifeq ($(PLATFORM),uefi)
 C_SRCS += bsp/$(PLATFORM)/cmdline.c
+else
+ifeq ($(PLATFORM), sbl)
+C_SRCS += boot/sbl/multiboot.c
+endif
 endif
 
 # retpoline support