trivial: Fix misspelling of firmware

Documentation/ia64/kvm.txt

...mentation/powerpc/dts-bindings/fsl/cpm_qe/qe/firmware.txt

arch/mips/sgi-ip27/ip27-smp.c

arch/sparc/kernel/head_64.S

drivers/net/sb1250-mac.c

drivers/net/tg3.c

drivers/net/wireless/ipw2x00/ipw2100.c

drivers/net/wireless/ipw2x00/ipw2200.c

drivers/net/wireless/iwlwifi/iwl-agn.c

drivers/net/wireless/iwlwifi/iwl3945-base.c

drivers/net/wireless/libertas/cmd.c

drivers/pci/pci.c

drivers/platform/x86/thinkpad_acpi.c

drivers/staging/otus/hal/hpmain.c

drivers/usb/atm/ueagle-atm.c

drivers/usb/serial/ChangeLog.history

include/linux/libata.h

kernel/power/disk.c

sound/oss/pss.c

sound/sh/aica.c