UBUNTU: SAUCE: ahci: thunderx2: stop engine fix update

UBUNTU: SAUCE: ahci: thunderx2: stop engine fix update

BugLink: https://bugs.launchpad.net/bugs/1724117
The current reset fix fails during continuous reboot test. The failure
happens when both the on-board SATA slots are used and when one of the
controllers are reset.

The latest ThunderX2 firmware (3.1) enables hardware error interrupts and
when the reset fix fails, we get a hang with the print:
[   14.839308] sd 1:0:0:0: [sdb] 468862128 512-byte logical blocks: (240 GB/224 GiB)
[   14.846796] sd 1:0:0:0: [sdb] 4096-byte physical blocks
[   14.852036] sd 1:0:0:0: [sdb] Write Protect is off
[   14.856843] sd 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[   14.866022] ata2.00: Enabling discard_zeroes_data

        *** NBU BAR Error 0x1e25c ***
         AddrLo 0x1d80180 AddrHi 0x0

To fix this issue, update the SATA reset fix to increase the delays between register writes.

Signed-off-by: Jayachandran C <jnair@caviumnetworks.com>
[ dannf: *** There is no need to carry this forward beyond artful *** ]
Signed-off-by: dann frazier <dann.frazier@canonical.com>
Acked-by: Marcelo Henrique Cerri <marcelo.cerri@canonical.com>
Acked-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
[kleber: fixed commit authorship]
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>