ath: Add regulatory mapping for Nicaragua

The country code is used by the ath to detect the ISO 3166-1 alpha-2 name
and to select the correct conformance test limits (CTL) for a country. If
the country isn't available and it is still programmed in the EEPROM then
it will cause an error and stop the initialization with:

  Invalid EEPROM contents

The current CTL mappings for this country are:

* 2.4GHz: FCC
* 5GHz: FCC
Signed-off-by: Sven Eckelmann <sven.eckelmann@openmesh.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/regd_common.h

@@ -435,6 +435,7 @@ static struct country_code_to_enum_rd allCountries[] = {
 	{CTRY_NETHERLANDS, ETSI1_WORLD, "NL"},
 	{CTRY_NETHERLANDS_ANTILLES, ETSI1_WORLD, "AN"},
 	{CTRY_NEW_ZEALAND, FCC2_ETSIC, "NZ"},
+	{CTRY_NICARAGUA, FCC3_FCCA, "NI"},
 	{CTRY_NORWAY, ETSI1_WORLD, "NO"},
 	{CTRY_OMAN, FCC3_WORLD, "OM"},
 	{CTRY_PAKISTAN, NULL1_WORLD, "PK"},