clk: ti: apll: not allocating enough data

There is a cut and paste bug here which will lead to memory corruption
because we don't allocate enough data.

Fixes: 4d008589 ('CLK: TI: APLL: add support for omap2 aplls')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>