wifi: rtw89: debugfs depends on CFG80211's one

wifi: rtw89: debugfs depends on CFG80211's one

The wiphy_locked_debugfs_read() and wiphy_locked_debugfs_write() used
by rtw89 are defined if CFG80211_DEBUGFS enabled. Add the dependency
accordingly.

Fixes: 8fdf78f3cd5f ("wifi: rtw89: debugfs: use wiphy_locked_debugfs_{read,write}() if needed")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202502101810.3CUpUL7p-lkp@intel.com/
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20250210123105.10466-1-pkshih@realtek.com