linux-yocto/5.4: update to v5.4.252

linux-yocto/5.4: update to v5.4.252

Updating  to the latest korg -stable release that comprises
the following commits:

    21732fd22497 Linux 5.4.252
    9399ea1ce481 x86: fix backwards merge of GDS/SRSO bit
    bc7b9a6c2ca4 xen/netback: Fix buffer overrun triggered by unusual packet
    43ed6f79b3e7 x86/cpu, kvm: Add support for CPUID_80000021_EAX
    1f0618bb2456 x86/bugs: Increase the x86 bugs vector size to two u32s
    08ba48152a8a tools headers cpufeatures: Sync with the kernel sources
    694b40dcfb41 x86/cpufeatures: Assign dedicated feature word for CPUID_0x8000001F[EAX]
    4fa849d4af68 x86/cpu: Add VM page flush MSR availablility as a CPUID feature
    998eec066607 x86/cpufeatures: Add SEV-ES CPU feature
    3e21d8b0f3a9 Documentation/x86: Fix backwards on/off logic about YMM support
    ad7670dd65cb x86/mm: Initialize text poking earlier
    979366f5c2aa mm: Move mm_cachep initialization to mm_init()
    3d1b8cfdd0c9 x86/mm: Use mm_alloc() in poking_init()
    ddcf05fe8850 x86/mm: fix poking_init() for Xen PV guests
    3f8968f1f0ad x86/xen: Fix secondary processors' FPU initialization
    e56c1e0f9134 KVM: Add GDS_NO support to KVM
    ed56430ab253 x86/speculation: Add Kconfig option for GDS
    e35c65794365 x86/speculation: Add force option to GDS mitigation
    f68f9f2df68e x86/speculation: Add Gather Data Sampling mitigation
    6e6044366897 x86/fpu: Move FPU initialization into arch_cpu_finalize_init()
    2ee37a46aa13 x86/fpu: Mark init functions __init
    77fe8150579c x86/fpu: Remove cpuinfo argument from init functions
    95356fff6fee init, x86: Move mem_encrypt_init() into arch_cpu_finalize_init()
    7aa2cec22e28 init: Invoke arch_cpu_finalize_init() earlier
    944d5c3ffa4b init: Remove check_bugs() leftovers
    a03ef708788e um/cpu: Switch to arch_cpu_finalize_init()
    98c3955e145f sparc/cpu: Switch to arch_cpu_finalize_init()
    568d68fc1dd4 sh/cpu: Switch to arch_cpu_finalize_init()
    18cd611a3eaa mips/cpu: Switch to arch_cpu_finalize_init()
    2febb4a73004 m68k/cpu: Switch to arch_cpu_finalize_init()
    1f4494ea77e8 ia64/cpu: Switch to arch_cpu_finalize_init()
    73719e89e32b ARM: cpu: Switch to arch_cpu_finalize_init()
    1743bc756b6b x86/cpu: Switch to arch_cpu_finalize_init()
    afe787cf253b init: Provide arch_cpu_finalize_init()

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>