ath79: fix ath9k calibration data size for AR9132
For ath9k NICs older than AR9287, The eeprom size is 0xeb8.
Fixes: https://github.com/openwrt/openwrt/issues/17196
Fixes: 74f2df9dbccd ("ath79: mtd-cal-data removals")
Signed-off-by: Shiji Yang <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/17261
Signed-off-by: Hauke Mehrtens <[email protected]>
(cherry picked from commit 96eb12e961748373a38738de92f5ef1a87f0cc75)