efi: memmap: Remove kernel-doc warnings

Remove kernel-doc warnings:

arch/x86/platform/efi/memmap.c:94: warning: Function parameter or member
'data' not described in 'efi_memmap_install'
arch/x86/platform/efi/memmap.c:94: warning: Excess function parameter
'ctx' description in 'efi_memmap_install'

Signed-off-by: Zhu Wang <wangzhu9@huawei.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>