Update Kconfig syntax highlighting: add new operators from Linux 4.2
Review Request #125312 - Created Sept. 25, 2015 and submitted
Linux 4.2 added the new relations >, <, >=, and <= to expressions in Tristate Logic.
Add them to the syntax highlighting file (kconfig.xml) accordingly.
Successfully highlighted arch/arm/Kconfig.debug from a current Linux snapshot (contains a >=) in Kate from 4.14.3 and 15.08.1.
Also works fine when replacing >= with >, <, or <=.