MAINTAINERS: Add Intel TDX entry

Add myself as Intel TDX maintainer.

I drove upstreaming most of TDX code so far and I will continue
working on TDX for foreseeable future.

[ dhansen: * Add myself as a reviewer too
	   * Swap Maintained=>Supported.  I double
	     checked Kirill is still being paid
	   * Add drivers/virt/coco/tdx-guest ]
Suggested-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Acked-by: Kai Huang <kai.huang@intel.com>
Link: https://lore.kernel.org/all/20231101233314.2567-1-kirill.shutemov%40linux.intel.com

MAINTAINERS

@@ -23460,6 +23460,20 @@ F:	arch/x86/kernel/dumpstack.c
 F:	arch/x86/kernel/stacktrace.c
 F:	arch/x86/kernel/unwind_*.c
 
+X86 TRUST DOMAIN EXTENSIONS (TDX)
+M:	Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
+R:	Dave Hansen <dave.hansen@linux.intel.com>
+L:	x86@kernel.org
+L:	linux-coco@lists.linux.dev
+S:	Supported
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/tdx
+F:	arch/x86/boot/compressed/tdx*
+F:	arch/x86/coco/tdx/
+F:	arch/x86/include/asm/shared/tdx.h
+F:	arch/x86/include/asm/tdx.h
+F:	arch/x86/virt/vmx/tdx/
+F:	drivers/virt/coco/tdx-guest
+
 X86 VDSO
 M:	Andy Lutomirski <luto@kernel.org>
 L:	linux-kernel@vger.kernel.org