ACK: [Xenial SRU][PATCH 0/1] ath10k: enhance rf signal strength

[Po-Hsu Lin]

Clean cherry-pick.
And since Z, A, B and linux-oem all contain this patch, T does not support
this chip. It's good to target it only on Xenial.
Acked-by: Po-Hsu Lin <po-hsu.lin at canonical.com>