12220 loader multi-console shouldn't override bootenv.rc

*** 18,27 ****
--- 18,28 ----
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2012 Gary Mills
+  * Copyright 2020 Joyent, Inc.
   *
   * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
*** 66,76 ****
  extern int bcons_getchar(void);
  extern int bcons_ischar(void);
  extern int bcons_gets(char *, int);
  
  #if !defined(_BOOT)
! extern void bcons_init2(char *, char *, char *);
  extern boolean_t bcons_hypervisor_redirect(void);
  extern void bcons_device_change(int);
  #endif /* !_BOOT */
  
  #ifdef __cplusplus
--- 67,77 ----
  extern int bcons_getchar(void);
  extern int bcons_ischar(void);
  extern int bcons_gets(char *, int);
  
  #if !defined(_BOOT)
! extern void bcons_post_bootenvrc(char *, char *, char *);
  extern boolean_t bcons_hypervisor_redirect(void);
  extern void bcons_device_change(int);
  #endif /* !_BOOT */
  
  #ifdef __cplusplus