x86/build: Use the proper name CONFIG_FW_LOADER

Commit in Fixes intends to add the expression regex only when FW_LOADER
is enabled - not FW_LOADER_BUILTIN. Latter is a leftover from a previous
patchset and not a valid config item.

So, adjust the condition to the actual name of the config.

[ bp: Cleanup commit message. ]

Fixes: c8dcf655ec81 ("x86/build: Tuck away built-in firmware under FW_LOADER")
Signed-off-by: Lukas Bulwahn <[e-mail]>
Signed-off-by: Borislav Petkov <[e-mail]>
Reviewed-by: Greg Kroah-Hartman <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/x86/tools/relocs.c

···
 	"(__parainstructions|__alt_instructions)(_end)?|"
 	"(__iommu_table|__apicdrivers|__smp_locks)(_end)?|"
 	"__(start|end)_pci_.*|"
-#if CONFIG_FW_LOADER_BUILTIN
+#if CONFIG_FW_LOADER
 	"__(start|end)_builtin_fw|"
 #endif
 	"__(start|stop)___ksymtab(_gpl)?|"