x86/sgx: Fix a typo in kernel-doc markup

Fix the following kernel-doc warning:

  arch/x86/include/uapi/asm/sgx.h:19: warning: expecting prototype \
    for enum sgx_epage_flags. Prototype was for enum sgx_page_flags instead

 [ bp: Launder the commit message. ]

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/ca11a4540d981cbd5f026b6cbc8931aa55654e00.1606897462.git.mchehab+huawei@kernel.org