According to clock framework, the clk_id could be NULL when getting clock.
But current code relies on a non null clk_id to get clock.
Changing the code to allow a null clk_id to get clock to make it more
reasonable to use.
And the regmap_mmio_gen_context will try to get clock by default but ignore
error if not finding the clock in case some regmap access not reply on
a specific clock.
Signed-off-by: Dong Aisheng <b29396@freescale.com>
(cherry picked from commit a60a38a5285ab27814f261ed39653c55a0a6e24b)
62734e95f6