load_addr: move to common env code

Rather than keep the load_addr definition with the bootm code (which
just happens to use this), move it to the common env code.  This way
we can disable bootm support completely while retaining load_addr
usage with many other commands.
Signed-off-by: NMike Frysinger <vapier@gentoo.org>

common/cmd_bootm.c

@@ -156,7 +156,6 @@ static boot_os_fn *boot_os[] = {
 #endif
 };
 
-ulong load_addr = CONFIG_SYS_LOAD_ADDR;	/* Default Load Address */
 static bootm_headers_t images;		/* pointers to os/initrd/fdt images */
 
 /* Allow for arch specific config before we boot */

common/cmd_nvedit.c

@@ -76,6 +76,8 @@ SPI_FLASH|MG_DISK|NVRAM|MMC|NOWHERE}
  */
 #define	MAX_ENV_SIZE	(1 << 20)	/* 1 MiB */
 
+ulong load_addr = CONFIG_SYS_LOAD_ADDR;	/* Default Load Address */
+
 /*
  * Table with supported baudrates (defined in config_xyz.h)
  */