scripts/spelling.txt: add "fimware" misspelling

A few instances of "fimware" instead of "firmware" were found.  Fix
these and add it to the spelling.txt file.

Signed-off-by: Kees Cook <[email protected]>
Reported-by: Randy Dunlap <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
4 files changed