m68k: Replace m68k-specific _[se]bss by generic __bss_{start,stop}

BSS_SECTION() provides the __bss_{start,stop} symbols, so there's no need
to wrap our own _[se]bss around it.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Greg Ungerer<gerg@uclinux.org>

arch/m68k/include/asm/sections.h

@@ -3,6 +3,4 @@
 
 #include <asm-generic/sections.h>
 
-extern char _sbss[], _ebss[];
-
 #endif /* _ASM_M68K_SECTIONS_H */