initrdscripts/init-install*: Add rootwait when installing to USB devices

It can take a bit for USB devices to be detected, so if a USB device is
your rootfs and you don't set rootwait you will most likely get a kernel
panic. Fix this by adding rootwait to the kernel command line on
installation.

Fixes [YOCTO #9462].

(From OE-Core rev: 40e2d36573a7a6bce377b1f9653607065ba5ffb6)

Signed-off-by: California Sullivan <california.l.sullivan@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/initrdscripts/files/init-install-efi.sh

@@ -144,6 +144,12 @@ if [ ! "${device#/dev/mmcblk}" = "${device}" ]; then
     part_prefix="p"
     rootwait="rootwait"
 fi
+
+# USB devices also require rootwait
+if [ -n `readlink /dev/disk/by-id/usb* | grep $TARGET_DEVICE_NAME` ]; then
+    rootwait="rootwait"
+fi
+
 bootfs=${device}${part_prefix}1
 rootfs=${device}${part_prefix}2
 swap=${device}${part_prefix}3

meta/recipes-core/initrdscripts/files/init-install.sh

@@ -152,6 +152,11 @@ if [ ! "${device#/dev/mmcblk}" = "${device}" ]; then
     rootwait="rootwait"
 fi
 
+# USB devices also require rootwait
+if [ -n `readlink /dev/disk/by-id/usb* | grep $TARGET_DEVICE_NAME` ]; then
+    rootwait="rootwait"
+fi
+
 if [ $grub_version -eq 0 ] ; then
     bios_boot=''
     bootfs=${device}${part_prefix}1