wifi: rtw89: 8852bt: Use standard helper for string choice

wifi: rtw89: 8852bt: Use standard helper for string choice

Use standard helper str_on_off() defined at string_choices.h in
_dpk_information() to improve code reusability. Reduce hardcoding
of repeated use of the same strings to save code space.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/r/202507282341.drTGfLWA-lkp@intel.com/
Signed-off-by: Akhilesh Patil <akhilesh@ee.iitb.ac.in>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/aJWNhu9bAkcjEyb4@bhairav-test.ee.iitb.ac.in