ppc4xx: Fix Canyonlands linker script (remove bogus ASSERT)

Signed-off-by: Stefan Roese <sr@denx.de>

board/amcc/canyonlands/u-boot.lds

@@ -139,8 +139,6 @@ SECTIONS
    *(COMMON)
   }
 
-  ppcenv_assert = ASSERT(. < 0xFFFF8000, ".bss section too big, overlaps .ppcenv section. Please update your confguration: CFG_MONITOR_BASE, CFG_MONITOR_LEN and TEXT_BASE may need to be modified.");
-
   _end = . ;
   PROVIDE (end = .);
 }