ath79: TP-Link EAP225-Outdoor v1: use pre-calibration nvmem-cell

ath79: TP-Link EAP225-Outdoor v1: use pre-calibration nvmem-cell

Fixes errors in the form of:
  ath10k_pci 0000:00:00.0: failed to fetch board data for bus=pci,
  vendor=168c,device=0056,subsystem-vendor=0000,subsystem-device
  =0000 from ath10k/QCA9888/hw2.0/board-2.bin
  ath10k_pci 0000:00:00.0: failed to fetch board-2.bin or board.bin
  from ath10k/QCA9888/hw2.0
  ath10k_pci 0000:00:00.0: failed to fetch board file: -12
  ath10k_pci 0000:00:00.0: could not probe fw (-12)

As described already in 2d3321619b2b ("ath79: TP-Link EAP245 v3: use
pre-calibration nvmem-cell"):
  Ath10k Wave-2 hardware requires an nvmem-cell called "pre-calibration"
  to load the device specific caldata, not "calibration".

Further rename the nvmem cell node and label to match the updated cell name.

Fixes: 23b904074500 ("ath79: TP-Link EAP225-Outdoor v1: convert ath10k to nvmem-cells")
Suggested-by: Sander Vanheule <sander@svanheule.net>
Signed-off-by: Nick Hainke <vincent@systemli.org>