Indentation should be done with spaces, not with TABs

There are still a lot of misc files in the QEMU code base that use TABs for indentation instead of using spaces:

 include/qemu/uri.h
 include/qemu/bitmap.h
 include/qemu/compiler.h
 include/exec/cpu-all.h
 include/hw/pci/pci_bridge.h
 include/hw/acpi/acpi.h
 include/hw/pcmcia.h
 include/hw/virtio/virtio.h
 include/hw/scsi/scsi.h
 include/hw/elf_ops.h
 include/hw/sd/sd.h
 include/disas/dis-asm.h
 include/crypto/desrfb.h
 include/crypto/aes.h
 include/elf.h
 pc-bios/optionrom/optionrom.h
 hw/char/parallel.c
 hw/char/serial.c
 hw/dma/etraxfs_dma.c
 hw/gpio/max7310.c
 hw/core/loader.c
 hw/input/ads7846.c
 hw/input/pckbd.c
 hw/input/ps2.c
 hw/sd/sd.c
 hw/watchdog/wdt_ib700.c
 hw/scsi/scsi-bus.c
 hw/rtc/twl92230.c
 hw/rtc/m48t59.c
 chardev/baum.c
 util/envlist.c
 util/bitops.c
 softmmu/physmem.c
 tests/qtest/fuzz/fuzz.c
 tests/unit/test-rcu-list.c
 crypto/desrfb.c

The TABs should be replaced with spaces, to make sure that we have a consistent coding style with an indentation of 4 spaces everywhere.