x86/cpu: Keep the PROCESSOR_SELECT menu together

x86/cpu: Keep the PROCESSOR_SELECT menu together

Having a stray kconfig symbol in the middle of the PROCESSOR_SELECT menu
(this symbol plus its dependent symbols) causes the menu dependencies
not to be displayed correctly in "make {menu,n,g,x}config".

Move the BROADCAST_TLB_FLUSH symbol away from the PROCESSOR_SELECT menu
so that the list of processors is displayed correctly.

Fixes: 767ae437a32d ("x86/mm: Add INVLPGB feature and Kconfig entry")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/20260519173526.10985-1-rdunlap@infradead.org