bloblist: Use 'phase' consistently for bloblists

We typically refer to the different U-Boot builds that a board runs
through as phases. This avoids confusion with the word 'stage' which is
used with bootstage, for example. Fix up some bloblist Kconfig help
which uses the wrong term.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/Kconfig b/common/Kconfig
index 0892d9b..ca136b1 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -717,7 +717,7 @@
 	  from TPL to SPL to U-Boot proper (and potentially to Linux). The
 	  blob list supports multiple binary blobs of data, each with a tag,
 	  so that different U-Boot components can store data which can survive
-	  through to the next stage of the boot.
+	  through to the next phase of the boot.
 
 config SPL_BLOBLIST
 	bool "Support for a bloblist in SPL"
@@ -746,7 +746,7 @@
 	  Sets the size of the bloblist in bytes. This must include all
 	  overhead (alignment, bloblist header, record header). The bloblist
 	  is set up in the first part of U-Boot to run (TPL, SPL or U-Boot
-	  proper), and this sane bloblist is used for subsequent stages.
+	  proper), and this sane bloblist is used for subsequent phases.
 
 config BLOBLIST_ALLOC
 	bool "Allocate bloblist"
@@ -760,7 +760,7 @@
 	default 0xc000 if SANDBOX
 	help
 	  Sets the address of the bloblist, set up by the first part of U-Boot
-	  which runs. Subsequent U-Boot stages typically use the same address.
+	  which runs. Subsequent U-Boot phases typically use the same address.
 
 	  This is not used if BLOBLIST_ALLOC is selected.