i386: Remove KEYLOCKER related feature since Panther Lake and Clearwater Forest

According to July 2025 SDM, Key locker will no longer be supported on
hardware 2025 onwards. This means for Panther Lake and Clearwater Forest,
the feature will not be enabled. Remove them from those two platforms.

gcc/ChangeLog:

	* config/i386/i386.h (PTA_PANTHERLAKE): Revmoe KL and WIDEKL.
	(PTA_CLEARWATERFOREST): Ditto.
	* doc/invoke.texi: Revise documentation.
2 files changed