patch for rpi3 on FreeBSD

[Mike Karels]

Hi, I have volunteered to coordinate a patch to u-boot for the Raspberry
Pi 3 on FreeBSD.  The problem is that with u-boot-2021.07 and the current
MMC overlay, the SD card slot is renumbered.  The SD card does not
configure, and the installation card doesn't boot.  The following patch
to include/configs/rpi.h fixes the problem.  Let me know if you need any
additional information.

Thanks,
		Mike

--- rpi.h.orig	2021-10-25 23:02:36.928520000 -0500
+++ rpi.h	2021-10-25 16:05:16.140924000 -0500
@@ -173,7 +173,8 @@
 #if CONFIG_IS_ENABLED(CMD_MMC)
 	#define BOOT_TARGET_MMC(func) \
 		func(MMC, mmc, 0) \
-		func(MMC, mmc, 1)
+		func(MMC, mmc, 1) \
+		func(MMC, mmc, 2)
 #else
 	#define BOOT_TARGET_MMC(func)
 #endif