soc: aspeed-lpc-ctrl: Fix clock cleanup in error path

Move syscon_regmap_lookup_by_compatible() above the
devm_clk_get() to avoid missing clk_disable_unprepare().

Fixes: 2f9b25fa ("soc: aspeed: Re-enable FWH2AHB on AST2600")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20210824085522.1849410-1-yangyingliang@huawei.com
Link: https://lore.kernel.org/r/20210825001214.3056193-1-joel@jms.id.au

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Signed-off-by: Arnd Bergmann <arnd@arndb.de>