x86: Add AMX XTILECFG and XTILEDATA components

x86: Add AMX XTILECFG and XTILEDATA components

The AMX TILECFG register and the TMMx tile data registers are
saved/restored via XSAVE, respectively in state component 17
(64 bytes) and state component 18 (8192 bytes).

Add AMX feature bits to x86_ext_save_areas array to set
up AMX components. Add structs that define the layout of
AMX XSAVE areas and use QEMU_BUILD_BUG_ON to validate the
structs sizes.

Signed-off-by: Jing Liu <[email protected]>
Signed-off-by: Yang Zhong <[email protected]>
Message-Id: <20220217060434[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>