Spawn Processes using memory primitives rather than and elf loader.

This allows us to remove the temporary syscall for that style of process
spawn.

sys/test.cpp

@@ -1,15 +1,11 @@
-#include <zcall.h>
-#include <zerrors.h>
+#include <mammoth/debug.h>
+#include <mammoth/process.h>
 
 constexpr uint64_t prog2 = 0x00000020'00000000;
 
 int main() {
-  ZDebug("Testing");
-  uint64_t err = ZProcessSpawnElf(Z_INIT_PROC_SELF, prog2, 0x2000);
-  if (err != Z_OK) {
-    ZDebug("Error");
-  } else {
-    ZDebug("Return");
-  }
+  dbgln("Testing");
+  check(SpawnProcessFromElfRegion(prog2));
+  dbgln("Return");
   return 0;
 }