clk: boston: unregister clks on failure in clk_boston_setup()

[ Upstream commit 8b627f616ed63dcaf922369fc14a5daf8ad03038 ]

The registered clks should unregister when something wrong happens
before going out in function clk_boston_setup().

Signed-off-by: Yi Wang <wang.yi59@zte.com.cn>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>