env: sf: avoid space in backend name

Remove space in ENV backend name for SPI Flash (SF)
to avoid issue with env select command.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/env/sf.c b/env/sf.c
index 3e524f2..a059561 100644
--- a/env/sf.c
+++ b/env/sf.c
@@ -305,7 +305,7 @@
 
 U_BOOT_ENV_LOCATION(sf) = {
 	.location	= ENVL_SPI_FLASH,
-	ENV_NAME("SPI Flash")
+	ENV_NAME("SPIFlash")
 	.load		= env_sf_load,
 	.save		= CONFIG_IS_ENABLED(SAVEENV) ? ENV_SAVE_PTR(env_sf_save) : NULL,
 #if defined(INITENV) && (CONFIG_ENV_ADDR != 0x0)