CPLD: Organize CPLD code into namespaces.

Use type aliases to hide actual CPLD type (somewhat).

firmware/common/cpld_update.hpp

@@ -24,12 +24,24 @@
 
 #include "portapack_cpld_data.hpp"
 
-bool cpld_update_if_necessary(
-	const portapack::cpld::Config config
+namespace portapack {
+namespace cpld {
+
+bool update_if_necessary(
+	const Config config
 );
 
-bool cpld_hackrf_load_sram();
-bool cpld_hackrf_verify_eeprom();
-void cpld_hackrf_init_from_eeprom();
+} /* namespace cpld */
+} /* namespace portapack */
+
+namespace hackrf {
+namespace cpld {
+
+bool load_sram();
+bool verify_eeprom();
+void init_from_eeprom();
+
+} /* namespace cpld */
+} /* namespace hackrf */
 
 #endif/*__CPLD_UPDATE_H__*/