syscalls: greatly simplify system call declaration

To define a system call, it's now sufficient to simply tag the inline
prototype with "__syscall" or "__syscall_inline" and include a special
generated header at the end of the header file.

The system call dispatch table and enumeration of system call IDs is now
automatically generated.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
diff --git a/kernel/include/kernel_offsets.h b/kernel/include/kernel_offsets.h
index cf967dc..cdb41c8 100644
--- a/kernel/include/kernel_offsets.h
+++ b/kernel/include/kernel_offsets.h
@@ -8,6 +8,8 @@
 #ifndef _kernel_offsets__h_
 #define _kernel_offsets__h_
 
+#include <syscall_list.h>
+
 /*
  * The final link step uses the symbol _OffsetAbsSyms to force the linkage of
  * offsets.o into the ELF image.