linux-milo: Kernel with cherry-picked QSPI changes

Before:
root@zedboard:~# dd if=/dev/mtd4 of=/dev/null bs=128k count=200
200+0 records in
200+0 records out
26214400 bytes (25.0MB) copied, 5.971374 seconds, 4.2MB/s

After:
root@zedboard:~# dd if=/dev/mtd4 of=/dev/null bs=128k count=200
200+0 records in
200+0 records out
26214400 bytes (25.0MB) copied, 1.080401 seconds, 23.1MB/s