arch/x86: Introduce `ARCH_ALL_STAGES_X86_64`

Though only one platform uses it, this will save some redundancy.

Change-Id: Ic151efe5dd9b7c89f779ac3e10c3a045f07221d3
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45730
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/src/cpu/qemu-x86/Kconfig b/src/cpu/qemu-x86/Kconfig
index af0c746..e72fbc3 100644
--- a/src/cpu/qemu-x86/Kconfig
+++ b/src/cpu/qemu-x86/Kconfig
@@ -12,11 +12,8 @@
 
 config CPU_QEMU_X86_64
 	bool "Experimental 64bit support"
-	select ARCH_BOOTBLOCK_X86_64
-	select ARCH_VERSTAGE_X86_64
-	select ARCH_ROMSTAGE_X86_64
+	select ARCH_ALL_STAGES_X86_64
 	select ARCH_POSTCAR_X86_64
-	select ARCH_RAMSTAGE_X86_64
 
 config CPU_QEMU_X86_32
 	bool