MAINTAINERS: Add Dave Hansen as reviewer for INTEL SGX

Add Dave as reviewer for INTEL SGX patches.
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lkml.kernel.org/r/20210205151546.144810-1-jarkko@kernel.org

MAINTAINERS

@@ -9227,6 +9227,7 @@ F:	include/linux/tboot.h
 
 INTEL SGX
 M:	Jarkko Sakkinen <jarkko@kernel.org>
+R:	Dave Hansen <dave.hansen@linux.intel.com>
 L:	linux-sgx@vger.kernel.org
 S:	Supported
 Q:	https://patchwork.kernel.org/project/intel-sgx/list/