loader: pass args along to unix in C
There's no reason why we can't pass the args gotten from the bootloader to
unix in C.
Note: loader's _start sets the ATAG pointer to 0x100.  This change simply
propagates it to unix.

*** 9,18 ****
--- 9,19 ----
   * http://www.illumos.org/license/CDDL.
   */
  
  /*
   * Copyright (c) 2014 Joyent, Inc.  All rights reserved.
+  * Copyright (c) 2015 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
   */
  
  #include "fakeloader.h"
  
  #include <sys/types.h>
*** 705,712 ****
          /* Renable caches */
          armv6_dcache_enable();
          armv6_icache_enable();
  
          /* we should never come back */
!         fakeload_exec(unix_start);
          fakeload_panic("hit the end of the world\n");
  }
--- 706,713 ----
          /* Renable caches */
          armv6_dcache_enable();
          armv6_icache_enable();
  
          /* we should never come back */
!         fakeload_exec(ident, ident2, chain, unix_start);
          fakeload_panic("hit the end of the world\n");
  }