style(llcc68): apply shared clang-format

Add a .clang-format file to the LLCC68 submodule so it can be formatted consistently when edited or checked out independently from the parent repository.

Reformat the tracked C and C++ driver sources with the shared style configuration.

include/llcc68.hpp

@@ -44,10 +44,10 @@ constexpr auto DEFAULT_BUSY_TIMEOUT_MS = 100;
  * @param ldro_on Low data rate optimization setting sent to the radio
  */
 constexpr airtime_t calc_time_on_air(uint8_t len, uint8_t sf, LoRaBandwidth bw,
-                                     LoRaCodingRate cr,
-                                     uint16_t preamble_length,
-                                     LoRaHeaderType header_type,
-                                     LoRaCrcType crc_type, bool ldro_on);
+									 LoRaCodingRate cr,
+									 uint16_t preamble_length,
+									 LoRaHeaderType header_type,
+									 LoRaCrcType crc_type, bool ldro_on);
 
 struct LLCC68 {
 	/** trivial getter */
@@ -253,7 +253,7 @@ struct LLCC68 {
 	expected<unit, error_code> set_rx_duty_cycle(uint32_t rx_period,
 												 uint32_t sleep_period);
 	expected<unit, error_code> set_rx_duty_cycle_ms(uint32_t rx_period_ms,
-												   uint32_t sleep_period_ms);
+													uint32_t sleep_period_ms);
 	expected<unit, error_code> set_sleep(sleep_config_t config);
 	expected<unit, error_code> set_tx_continuous_wave();
 	expected<unit, error_code> set_tx_infinite_preamble();