wifi: iwlwifi: remove redundant reading from NVM file

The driver reads xtal_calib from NVM file, but actually never uses it.
This is only used in dvm driver.

Signed-off-by: Chaya Rachel Ivgi <chaya.rachel.ivgi@intel.com>
Reviewed-by: Luciano Coelho <luciano.coelho@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20240510170500.c4d1a4571049.I7d7b73dccb793e220f023e0d049b082b043ca95e@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>