[bsp][frdm-k64f] update MDK linker script.

bsp/frdm-k64f/MK64F.sct

@@ -7,7 +7,7 @@ LR_IROM1 0x00000000 0x100000  {    ; load region size_region (1000k)
   }
   ; 8_byte_aligned(62 vect * 4 bytes) =  8_byte_aligned(0x194) = 0x198
   ; 0x40000 - 0x198 = 0x3FE68
-  RW_IRAM1 0x1FFF0198 0x3FE68 {
+  RW_IRAM2 0x20000000 0x30000 {
    .ANY (+RW +ZI)
   }
 }