sparc: Update PROM initialization code for generic board

Fixed the prom_relocate() function in start.S file by reserving memory in
the board_init_f sequence and saving the offset to the __prom_start_reloc
variable. This value is used as the destination when relocating the PROM.

Add the prom_init() function to the end of the board_init_r sequence.

Signed-off-by: Francois Retief <fgretief@spaceteq.co.za>
diff --git a/common/board_r.c b/common/board_r.c
index f1dfa68..3bf49fd 100644
--- a/common/board_r.c
+++ b/common/board_r.c
@@ -66,6 +66,10 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+#if defined(CONFIG_SPARC)
+extern int prom_init(void);
+#endif
+
 ulong monitor_flash_len;
 
 __weak int board_flash_wp_on(void)
@@ -934,6 +938,9 @@
 #ifdef CONFIG_PS2KBD
 	initr_kbd,
 #endif
+#if defined(CONFIG_SPARC)
+	prom_init,
+#endif
 	run_main_loop,
 };