scripts: fix finding nand/mtd boot on some devices

Fixes #2619

scripts/util_functions.sh

@@ -165,7 +165,7 @@ recovery_cleanup() {
 # find_block [partname...]
 find_block() {
   for BLOCK in "$@"; do
-    DEVICE=`find /dev/block -type l -iname $BLOCK | head -n 1` 2>/dev/null
+    DEVICE=`find /dev \( -type b -o -type c -o -type l \) -iname $BLOCK | head -n 1` 2>/dev/null
     if [ ! -z $DEVICE ]; then
       readlink -f $DEVICE
       return 0
@@ -372,7 +372,7 @@ find_boot_image() {
   fi
   if [ -z $BOOTIMAGE ]; then
     # Lets see what fstabs tells me
-    BOOTIMAGE=`grep -v '#' /etc/*fstab* | grep -E '/boot[^a-zA-Z]' | grep -oE '/dev/[a-zA-Z0-9_./-]*' | head -n 1`
+    BOOTIMAGE=`grep -v '#' /etc/*fstab* | grep -E '/boot(img)?[^a-zA-Z]' | grep -oE '/dev/[a-zA-Z0-9_./-]*' | head -n 1`
   fi
 }