[memory] access 16k eeprom area by pointer, don't specifically allocate it

Partially revert "[memory] allocate separate 16k eeprom area"

This partially reverts commit eba62ba245.

firmware/chip/sections.ld

@@ -115,14 +115,6 @@ SECTIONS
 		__fixed_end = .;
 	} > FLASH
 
-    /* EEPROM goes in its own section */
-    .eeprom :
-    {   
-		. = ALIGN(4);
-        *(.eeprom .eeprom*)   
-		. = ALIGN(4);
-    } > EEPROM   
-
 	/* .ARM.exidx is sorted, so has to go in its own output section.  */
 	PROVIDE_HIDDEN (__exidx_start = .);
 	.ARM.exidx :

firmware/src/memory.c

@@ -37,10 +37,8 @@
 /**
  * Allocate a 16KB section of flash memory, aligned to an NVM row
  */
-const uint8_t nvm_section[MEM_SIZE]
-  __attribute__ ((aligned (256)))
-  __attribute__ ((section (".eeprom")))
-  = { 0xFF };
+volatile uint8_t* nvm_section =
+  (uint8_t*)(0x0003C000);       /* 256K - 16K */
 
 /**
  * Poll the status register until the busy bit is cleared