tftpput: add save_addr and save_size global variables

We need something akin to load_addr to handle saving data.
Signed-off-by: NSimon Glass <sjg@chromium.org>

common/cmd_nvedit.c

@@ -79,6 +79,8 @@ SPI_FLASH|MG_DISK|NVRAM|MMC} or CONFIG_ENV_IS_NOWHERE
 #define	MAX_ENV_SIZE	(1 << 20)	/* 1 MiB */
 
 ulong load_addr = CONFIG_SYS_LOAD_ADDR;	/* Default Load Address */
+ulong save_addr;			/* Default Save Address */
+ulong save_size;			/* Default Save Size (in bytes) */
 
 /*
  * Table with supported baudrates (defined in config_xyz.h)

include/common.h

@@ -284,6 +284,8 @@ void flash_perror (int);
 int	source (ulong addr, const char *fit_uname);
 
 extern ulong load_addr;		/* Default Load Address */
+extern ulong save_addr;		/* Default Save Address */
+extern ulong save_size;		/* Default Save Size */
 
 /* common/cmd_doc.c */
 void	doc_probe(unsigned long physadr);