[srv.init] Iterate and load drivers and services from initrd

Previously we were hard-coding loading specific files (the UART driver
and logging server) from the initrd. Now j6romfs has a for_each() method
to allow iterating all files in a directory, and init loads all programs
from /jsix/drivers and /jsix/services. Eventually this will need more
dynamic loading decisions for drivers but for now it's fine.

src/user/srv.init/loader.cpp

@@ -141,7 +141,6 @@ load_program(
         return false;
     }
 
-    delete [] reinterpret_cast<const uint8_t*>(data.pointer);
     return true;
 }