clk: qoriq: add pll clock to clock lookup table

clk: qoriq: add pll clock to clock lookup table

Register each PLL and its division clocks to clock
lookup table to facilitate the clock look up for
clock consumer.

Signed-off-by: Tang Yuantian <andy.tang@nxp.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>