spl: uniphier: Drop spl_board_announce_boot_device()

This function is not used anymore. Drop it.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/arm/mach-uniphier/boot-mode/spl_board.c

@@ -12,11 +12,6 @@
 
 #include "../soc-info.h"
 
-void spl_board_announce_boot_device(void)
-{
-	printf("eMMC");
-}
-
 struct uniphier_romfunc_table {
 	void *mmc_send_cmd;
 	void *mmc_card_blockaddr;