bootm: Create bootm_final() for pre-boot cleanup

There are various functions which announce that booting is imminent and
do related preparation. Most of these are arch-specific.

In practice, most archs do a similar thing. It would be better to
have a common function, with perhaps some events for things that are
really arch- and board-specific.

Create a new bootm_final() function with the common pre-boot steps:
printing the "Starting kernel" message, recording bootstage data,
optionally writing bootstage to the FDT and printing a report, and
removing active devices.

Be careful to avoid using BIT() macros which are not available with host
tools.

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

boot/bootm.c

@@ -7,6 +7,7 @@
 #ifndef USE_HOSTCC
 #include <bootm.h>
 #include <bootstage.h>
+#include <dm/root.h>
 #include <cli.h>
 #include <command.h>
 #include <cpu_func.h>
@@ -1194,6 +1195,27 @@ void __weak switch_to_non_secure_mode(void)
 {
 }
 
+void bootm_final(int flag)
+{
+	printf("\nStarting kernel ...%s\n\n",
+	       (flag & BOOTM_STATE_OS_FAKE_GO) ?
+	       " (fake run for tracing)" : "");
+
+	bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
+
+	if (IS_ENABLED(CONFIG_BOOTSTAGE_FDT) && IS_ENABLED(CONFIG_CMD_FDT))
+		bootstage_fdt_add_report();
+	if (IS_ENABLED(CONFIG_BOOTSTAGE_REPORT))
+		bootstage_report();
+
+	/*
+	 * Call remove function of all devices with a removal flag set.
+	 * This may be useful for last-stage operations, like cancelling
+	 * of DMA operation or releasing device internal buffers.
+	 */
+	dm_remove_devices_active();
+}
+
 #else /* USE_HOSTCC */
 
 #if defined(CONFIG_FIT_SIGNATURE)