efi_loader: rename __efi_hello_world_*

In scripts/Makefile.lib we build section including helloworld.efi.
This allows to load the EFI binary with command 'bootefi hello'.

scripts/Makefile.lib contains explicit references to strings
containing helloworld and hello_world. This makes it impossible
to generalize the coding to accomodate additional built in
EFI binaries.

Let us rename the variables __efi_hello_world_* to
__efi_helloworld_*.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h
index daf021b..b653570 100644
--- a/include/asm-generic/sections.h
+++ b/include/asm-generic/sections.h
@@ -22,8 +22,8 @@
 extern char __entry_text_start[], __entry_text_end[];
 extern char __initdata_begin[], __initdata_end[];
 extern char __start_rodata[], __end_rodata[];
-extern char __efi_hello_world_begin[];
-extern char __efi_hello_world_end[];
+extern char __efi_helloworld_begin[];
+extern char __efi_helloworld_end[];
 
 /* Start and end of .ctors section - used for constructor calls. */
 extern char __ctors_start[], __ctors_end[];