functions: Clear recovery logs from CrOS p12

Accumulated recovery logs in partition 12 on the internal drive
can eat up space and prevent flashrom and/or cbfstool from downloading.
Clear them to ensure sufficient space,

Addresses issue #156

Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>

functions.sh

@@ -189,6 +189,8 @@ if [ ! -f ${cbfstoolcmd} ]; then
                 return 1
             fi
         fi
+		# clear recovery logs which use valuable space
+		rm -rf /tmp/boot/recovery* 2>/dev/null
         #create util dir
         mkdir /tmp/boot/util 2>/dev/null
         cd /tmp/boot/util
@@ -243,6 +245,8 @@ if [ ! -f ${flashromcmd} ]; then
                 return 1
             fi
         fi
+		# clear recovery logs which use valuable space
+		rm -rf /tmp/boot/recovery* 2>/dev/null
         #create util dir
         mkdir /tmp/boot/util 2>/dev/null
         cd /tmp/boot/util