fix the ld

bsp/nrf5x/libraries/templates/nrfx/board/linker_scripts/link.lds

@@ -7,7 +7,6 @@ MEMORY
 {
   FLASH (rx) : ORIGIN = 0x0, LENGTH = 0x100000
   RAM (rwx) :  ORIGIN = 0x20000000, LENGTH = 0x40000
-  CODE_RAM (rwx) : ORIGIN = 0x800000, LENGTH = 0x10000
 }
 
 INCLUDE "packages/nrfx-v2.1.0/mdk/nrf_common.ld"