mac80211: enable ath10k LED support by default

mac80211: enable ath10k LED support by default

Commit 61d57a2f88b90ba951012e66c7c6fae9234c97b4 adds ath10k LED
support, but doesn't add an option to actually enable it.

After enabling this option, a LED named ath10k-phy0 appears in sysfs,
and a trigger can be assigned to it. Since 60deb3cdef4a the default set
trigger is the tpt one.

Enable it by default, as most devices using ath10k chips shouldn't be
severely space-constrained. There are likely many devices that can
benefit from having it enabled, like my testing device.

Before:
   text    data     bss     dec     hex filename
 245311    8899      16  254226   3e112 ath10k_core.ko

After:
   text    data     bss     dec     hex filename
 245979    8899      16  254894   3e3ae ath10k_core.ko

Tested on a D-Link DAP-2695-A1 (ar71xx).

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
(backported from 34e22653ac18b6ac7fd368ca47625f665808067f)