[inc][c++] add some additional __BEGIN_CDECL/__END_CDECLS to various global headers

Just a few that were missed, and picked up with some additional C++ code.

top/include/lk/console_cmd.h

@@ -12,6 +12,8 @@
 #include <stddef.h>
 #include <sys/types.h>
 
+__BEGIN_CDECLS
+
 /* command args */
 typedef struct {
     const char *str;
@@ -27,6 +29,8 @@ typedef int (*console_cmd_func)(int argc, const console_cmd_args *argv);
 #define CMD_AVAIL_PANIC  (0x1 << 1)
 #define CMD_AVAIL_ALWAYS (CMD_AVAIL_NORMAL | CMD_AVAIL_PANIC)
 
+__END_CDECLS
+
 /* Register a static block of commands at init time when lib/console is
  * paret of the build. Otherwise stub out these definitions so that they do
  * not get included.
@@ -47,4 +51,5 @@ typedef int (*console_cmd_func)(int argc, const console_cmd_args *argv);
 #define STATIC_COMMAND(command_str, help_str, func)
 #define STATIC_COMMAND_MASKED(command_str, help_str, func, availability_mask)
 
+
 #endif

top/include/lk/init.h

@@ -10,6 +10,8 @@
 #include <lk/compiler.h>
 #include <sys/types.h>
 
+__BEGIN_CDECLS
+
 /*
  * LK's init system
  */
@@ -69,3 +71,5 @@ struct lk_init_struct {
 
 #define LK_INIT_HOOK(_name, _hook, _level) \
     LK_INIT_HOOK_FLAGS(_name, _hook, _level, LK_INIT_FLAG_PRIMARY_CPU)
+
+__END_CDECLS

top/include/lk/main.h

@@ -10,7 +10,10 @@
 #include <lk/compiler.h>
 #include <sys/types.h>
 
+__BEGIN_CDECLS
 
 void lk_main(ulong arg0, ulong arg1, ulong arg2, ulong arg3) __NO_RETURN __EXTERNALLY_VISIBLE;
 void lk_secondary_cpu_entry(void);
 void lk_init_secondary_cpus(uint secondary_cpu_count);
+
+__END_CDECLS