Promote the booting priority of scsi and ata.

Promote the booting priority of scsi and ata.

Promote the booting priority of scsi and ata. SATA disk loading will
waste many msecs, it will delay the whole Tizen system boot-up
procedure. Hence, promote the priority of sata/ata modules before tty
devices will improve kernel booting performance. From testing with
vtc1010, kernel-3.14.19, and kingston 120GB ssd, the original kernel
booting time is 1.314s; after tuning scsi/ata, the kernel booting time
is 948ms.

Change-Id: I8023ace1b1a30f09b5b76cac3be732b1c939f873
Signed-off-by: Fang, Neo <neo.fang@intel.com>