riscv: Call bootm_final()

The RISC-V announce_and_cleanup() duplicates the common pre-boot
steps. Replace it with a call to bootm_final().

Move board_quiesce_devices() into bootm_final() so it is available to
all architectures. Drop the RISC-V weak definition and header
declaration since the generic one in bootm.h is used instead.

Signed-off-by: Simon Glass <simon.glass@canonical.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

boot/bootm.c

@@ -1208,6 +1208,8 @@ void bootm_final(int flag)
 	if (IS_ENABLED(CONFIG_BOOTSTAGE_REPORT))
 		bootstage_report();
 
+	board_quiesce_devices();
+
 	/*
 	 * Call remove function of all devices with a removal flag set.
 	 * This may be useful for last-stage operations, like cancelling