staging: rtl8723bs: introduce kmemdup() where applicable

staging: rtl8723bs: introduce kmemdup() where applicable

Replace memory allocation followed by memcpy() with kmemdup() to simplify
the code and improve readability.

About GFP Flags:
- GFP_ATOMIC is used for allocations in atomic contexts such as
  spinlock-protected sections, tasklets, and timer handlers.
- GFP_KERNEL is used for process contexts where sleeping is allowed.

Specifically, in OnAssocReq(), GFP_ATOMIC is used because
the allocation is performed while holding a spin lock.

Signed-off-by: Minu Jin <s9430939@naver.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Link: https://patch.msgid.link/20260204131347.3515949-2-s9430939@naver.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>