scripts/spdxcheck.py: Fix a typo

s/Initilize/Initialize/

Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com>
Link: https://lore.kernel.org/r/20210326091443.26525-1-unixbhaskar@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>