Revert "global_data: Drop spl_handoff"

This breaks chromebook_coral which says:

   Video: No video mode configured in FSP!

This reverts commit 2e9313179a846b581c0fc3f6a49e19f3d343efa8.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h
index 26277b9..789adf2 100644
--- a/include/asm-generic/global_data.h
+++ b/include/asm-generic/global_data.h
@@ -400,6 +400,12 @@
 	 */
 	struct bloblist_hdr *bloblist;
 #endif
+#if CONFIG_IS_ENABLED(HANDOFF)
+	/**
+	 * @spl_handoff: SPL hand-off information
+	 */
+	struct spl_handoff *spl_handoff;
+#endif
 #if defined(CONFIG_TRANSLATION_OFFSET)
 	/**
 	 * @translation_offset: optional translation offset
diff --git a/include/handoff.h b/include/handoff.h
index 0072ea8..c0ae7b1 100644
--- a/include/handoff.h
+++ b/include/handoff.h
@@ -32,13 +32,6 @@
 void handoff_load_dram_banks(struct spl_handoff *ho);
 
 /**
- * handoff_get() - Get the SPL handoff information
- *
- * Return: Pointer to SPL handoff if received, else NULL
- */
-struct spl_handoff *handoff_get(void);
-
-/**
  * handoff_arch_save() - Save arch-specific info into the handoff area
  *
  * This is defined to an empty function by default, but arch-specific code can