env: Drop the env_name_spec global

Add a name to the driver and use that instead of the global variable
declared by each driver.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/env/sf.c b/env/sf.c
index a07641b..07386c6 100644
--- a/env/sf.c
+++ b/env/sf.c
@@ -48,8 +48,6 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-char *env_name_spec = "SPI Flash";
-
 static struct spi_flash *env_flash;
 
 static int setup_flash_device(void)
@@ -346,6 +344,7 @@
 
 U_BOOT_ENV_LOCATION(sf) = {
 	.location	= ENVL_SPI_FLASH,
+	ENV_NAME("SPI Flash")
 	.load		= env_sf_load,
 #ifdef CMD_SAVEENV
 	.save		= env_save_ptr(env_sf_save),