clk: samsung: Fix UBSAN panic in samsung_clk_init()

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

clk: samsung: Fix UBSAN panic in samsung_clk_init()

With UBSAN_ARRAY_BOUNDS=y, I'm hitting the below panic due to

dereferencing `ctx->clk_data.hws` before setting

`ctx->clk_data.num = nr_clks`. Move that up to fix the crash.

UBSAN: array index out of bounds: 00000000f2005512 [#1] PREEMPT SMP

<snip>

Call trace:

samsung_clk_init+0x110/0x124 (P)

samsung_clk_init+0x48/0x124 (L)

samsung_cmu_register_one+0x3c/0xa0

exynos_arm64_register_cmu+0x54/0x64

__gs101_cmu_top_of_clk_init_declare+0x28/0x60

...