clk: socfpga: use clk_hw_register for a5/c5

clk: socfpga: use clk_hw_register for a5/c5

[ Upstream commit 1454547cbb9d9b9eb164c1e5dadde6d04812b8b6 ]

As recommended by Stephen Boyd, convert the cyclone5/arria5 clock driver
to use the clk_hw registration method.

Suggested-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
Link: https://lore.kernel.org/r/20210302214151.1333447-1-dinguyen@kernel.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Stable-dep-of: 390784ded6c3 ("clk: socfpga: Fix memory leak in socfpga_gate_init()")
Signed-off-by: Sasha Levin <sashal@kernel.org>