clk: socfpga: cleanup spdx tags

Replace tabs with spaces in SPDX tag

Signed-off-by: Tom Rix <trix@redhat.com>
Link: https://lore.kernel.org/r/20220217173453.3262672-1-trix@redhat.com


Acked-by: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>