staging: rtl8723bs: add blank line after declaration

Fix the checkpatch.pl warning:
"WARNING: Missing a blank line after declarations"
in drv_types.h.

Add a blank line between the variable declaration and the subsequent
statement in RTW_ENABLE_FUNC() to comply with the kernel coding style.

Signed-off-by: Dang Vu Duc Hien <dvdh12707@gmail.com>
Link: https://patch.msgid.link/20260727195236.663392-1-dvdh12707@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>