board: amlogic: jethub j100: add rescue boot from microSD

The new JetHub D1+ has a microSD slot. Add rescue boot from microSD

Signed-off-by: Viacheslav Bocharov <adeep@lexina.in>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20221222093358.204520-1-adeep@lexina.in
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
diff --git a/include/configs/jethub.h b/include/configs/jethub.h
index 35f8509..e22db49 100644
--- a/include/configs/jethub.h
+++ b/include/configs/jethub.h
@@ -12,6 +12,7 @@
 #define BOOTENV_DEV_RESCUE(devtypeu, devtypel, instance) \
 	"bootcmd_rescue=" \
 		"if gpio input 10; then " \
+		"run bootcmd_mmc0; " \
 		"run bootcmd_usb0;" \
 		"fi;\0"
 #else