efi_loader: EFI_PRINT instead of debug for memory services

For debug messages inside EFI API functions we should use the EFI_PRINT
macro which gives us well aligned output like:

EFI: Entry efi_allocate_pool_ext(4, 14, 000000007edd7718)
  EFI: efi_add_memory_map: 0x7dcfa000 0x1 4 yes
EFI: Exit: efi_allocate_pool_ext: 0

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>