Intel IPU3 ImgU: Move firmware file under intel/ipu

This makes packaging IPU firmware files more straightforward. Update the
links, too.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>

WHENCE

@@ -1161,10 +1161,11 @@ Also available from http://wireless.kernel.org/en/users/Drivers/iwlwifi#Firmware
 
 Driver: ipu3-imgu - Intel IPU3 (3rd Gen Image Processing Unit) driver
 
-File: intel/irci_irci_ecr-master_20161208_0213_20170112_1500.bin
+File: intel/ipu/irci_irci_ecr-master_20161208_0213_20170112_1500.bin
 Version: irci_irci_ecr-master_20161208_0213_20170112_1500
 md5sum: 59abc311fce49c5a180b5a8a3917912d
-Link: intel/ipu3-fw.bin -> irci_irci_ecr-master_20161208_0213_20170112_1500.bin
+Link: intel/ipu3-fw.bin -> ipu/irci_irci_ecr-master_20161208_0213_20170112_1500.bin
+Link: intel/irci_irci_ecr-master_20161208_0213_20170112_1500.bin -> ipu/irci_irci_ecr-master_20161208_0213_20170112_1500.bin
 
 Licence: Redistributable. See LICENSE.ipu3_firmware for details