arch/Config.in.x86: drop AVX512 from alderlake

Alder Lake CPUs have AVX512 support disabled [0].

To prevent potential issues, remove the AVX512 support advertisement.

This puts Buildroot inline with the GCC options [1].

[0]: https://www.intel.com/content/www/us/en/support/articles/000089918/processors.html
[1]: https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html

Fixes: e7b94130 ("arch/Config.in.x86: add sapphirerapids, alderlake, rocketlake")
Signed-off-by: Vincent Fazio <vfazio@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit f82a65b15b1805b9cbde0220e68e0267d0dbdb2b)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

arch/Config.in.x86

@@ -450,7 +450,6 @@ config BR2_x86_alderlake
 	select BR2_X86_CPU_HAS_SSE42
 	select BR2_X86_CPU_HAS_AVX
 	select BR2_X86_CPU_HAS_AVX2
-	select BR2_X86_CPU_HAS_AVX512
 	select BR2_ARCH_NEEDS_GCC_AT_LEAST_11
 config BR2_x86_rocketlake
 	bool "rocketlake"