clk: imx: Fix an out-of-bounds access in dispmix_csr_clk_dev_data

In the Linux kernel, the following vulnerability has been resolved:

clk: imx: Fix an out-of-bounds access in dispmix_csr_clk_dev_data

When num_parents is 4, __clk_register() occurs an out-of-bounds

when accessing parent_names member. Use ARRAY_SIZE() instead of

hardcode number here.

BUG: KASAN: global-out-of-bounds in __clk_register+0x1844/0x20d8

Read of size 8 at addr ffff800086988e78 by task kworker/u24:3/59

Hardware name: NXP i.MX95 19X19 board (DT)

Workqueue: events_unbound deferred_probe_work_func

Call trace:

dump_backtrace+0x94/0xec

show_stack+0x18/0x24

dump_stack_lvl+0x8c/0xcc

print_report+0x398/0x5fc

kasan_report+0xd4/0x114

__asan_report_load8_noabort+0x20/0x2c

__clk_register+0x1844/0x20d8

clk_hw_register+0x44/0x110

__clk_hw_register_mux+0x284/0x3a8

imx95_bc_probe+0x4f4/0xa70