ath10k: create firmware symlink for calibration data.

Create link from /lib/firmware/ath10k/cal-pci-0001:01:00.0.bin to
/tmp/ath10k_cal/cal_data_patch.bin. If it exists, it is used instead
of the OTP and is read when the driver is loaded.

Change-Id: I1fde91ac61d17aed8ae29e92fe106e99d5859667
diff --git a/ath10k/cal-pci-0001:01:00.0.bin b/ath10k/cal-pci-0001:01:00.0.bin
new file mode 120000
index 0000000..0e08bae
--- /dev/null
+++ b/ath10k/cal-pci-0001:01:00.0.bin
@@ -0,0 +1 @@
+/tmp/ath10k_cal/cal_data_patch.bin
\ No newline at end of file