cpu/x86: Drop !CPU_INFO_V2 code

Now that all platforms use parallel_mp this is the only codepath used
for cpu_info() local thread storage.

Change-Id: I119214e703aea8a4fe93f83b784159cf86d859d3
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69122
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/cpu/x86/Kconfig

@@ -2,7 +2,6 @@ if ARCH_X86
 
 config PARALLEL_MP
 	def_bool y
-	select CPU_INFO_V2
 	help
 	 This option uses common MP infrastructure for bringing up APs
 	 in parallel. It additionally provides a more flexible mechanism
@@ -210,12 +209,4 @@ config RESERVE_MTRRS_FOR_OS
 	  However, modern OSes use PAT to control cacheability instead of
 	  using MTRRs.
 
-config CPU_INFO_V2
-	bool
-	depends on PARALLEL_MP
-	help
-	  Enables the new method of locating struct cpu_info. This new method
-	  uses the %gs segment to locate the cpu_info pointer. The old method
-	  relied on the stack being CONFIG_STACK_SIZE aligned.
-
 endif # ARCH_X86