mm/shm: Switch to use process' common virtual memory region allocator

- Also remove the nuttx private shm.h file nuttx/mm/shm.h, which became redundant
- Also remove the gran allocator initialization/release in binfmt since common
  vpage allocator is initialized in group_create/group_leave

Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>

binfmt/binfmt_execmodule.c

@@ -34,7 +34,6 @@
 #include <nuttx/arch.h>
 #include <nuttx/kmalloc.h>
 #include <nuttx/sched.h>
-#include <nuttx/mm/shm.h>
 #include <nuttx/binfmt/binfmt.h>
 
 #include "binfmt.h"
@@ -227,17 +226,6 @@ int exec_module(FAR const struct binary_s *binp,
     }
 #endif
 
-#ifdef CONFIG_MM_SHM
-  /* Initialize the shared memory virtual page allocator */
-
-  ret = shm_group_initialize(tcb->cmn.group);
-  if (ret < 0)
-    {
-      berr("ERROR: shm_group_initialize() failed: %d\n", ret);
-      goto errout_with_tcbinit;
-    }
-#endif
-
 #ifdef CONFIG_PIC
   /* Add the D-Space address as the PIC base address.  By convention, this
    * must be the first allocated address space.