Documentation: Remove "mfgpt_irq=" from the kernel-parameters.txt file

The kernel parameter mfgpt_irq has been removed in 2009 already by

  c95d1e5 ("cs5535: drop the Geode-specific MFGPT/GPIO code")

Time to remove it from the documentation now, too.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Nikolay Borisov <nik.borisov@suse.com>
Link: https://lore.kernel.org/r/20240614090306.561464-1-thuth@redhat.com

Author: huth

Documentation/admin-guide/kernel-parameters.txt

@@ -3429,10 +3429,6 @@
 			deep    - Suspend-To-RAM or equivalent (if supported)
 			See Documentation/admin-guide/pm/sleep-states.rst.
 
-	mfgpt_irq=	[IA-32] Specify the IRQ to use for the
-			Multi-Function General Purpose Timers on AMD Geode
-			platforms.
-
 	mfgptfix	[X86-32] Fix MFGPT timers on AMD Geode platforms when
 			the BIOS has incorrectly applied a workaround. TinyBIOS
 			version 0.98 is known to be affected, 0.99 fixes the