Adjust K66F GCC_ARM linker file

Move heap_0 after .data as it is also placed to m_data.

Author: Arto Kinnunen

targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/TARGET_K66F/device/TOOLCHAIN_GCC_ARM/MK66FN2M0xxx18.ld

@@ -210,14 +210,6 @@ SECTIONS
     __CRASH_DATA_RAM_END__ = .; /* Define a global symbol at data end */
   } > m_data
 
-  .heap_0 :
-  {
-    . = ALIGN(8);
-    __mbed_sbrk_start_0 = .;
-    . += (ORIGIN(m_data) + LENGTH(m_data) - .);
-    __mbed_krbs_start_0 = .;
-  } > m_data
-
   __VECTOR_RAM = DEFINED(__ram_vector_table__) ? __VECTOR_RAM__ : ORIGIN(m_interrupts);
   __RAM_VECTOR_TABLE_SIZE_BYTES = DEFINED(__ram_vector_table__) ? (__interrupts_ram_end__ - __interrupts_ram_start__) : 0x0;
 
@@ -233,6 +225,14 @@ SECTIONS
     __data_end__ = .;        /* define a global symbol at data end */
   } > m_data
 
+  .heap_0 :
+  {
+    . = ALIGN(8);
+    __mbed_sbrk_start_0 = .;
+    . += (ORIGIN(m_data) + LENGTH(m_data) - .);
+    __mbed_krbs_start_0 = .;
+  } > m_data
+
   __DATA_END = __DATA_ROM + (__data_end__ - __data_start__);
   text_end = ORIGIN(m_text) + LENGTH(m_text);
   ASSERT(__DATA_END <= text_end, "region m_text overflowed with text and data")