x86/vmlinux.lds.S: Take __START_KERNEL out conditional definition

If CONFIG_X86_32=y, the section start address is defined to be
"LOAD_OFFSET + LOAD_PHYSICAL_ADDR", which is the same as
__START_KERNEL_map.

Unify it with the 64-bit definition to simplify the code.
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20240313075839.8321-5-richard.weiyang@gmail.com

arch/x86/kernel/vmlinux.lds.S

@@ -110,11 +110,10 @@ PHDRS {
 
 SECTIONS
 {
+	. = __START_KERNEL;
 #ifdef CONFIG_X86_32
-	. = LOAD_OFFSET + LOAD_PHYSICAL_ADDR;
 	phys_startup_32 = ABSOLUTE(startup_32 - LOAD_OFFSET);
 #else
-	. = __START_KERNEL;
 	phys_startup_64 = ABSOLUTE(startup_64 - LOAD_OFFSET);
 #endif