staging: r8188eu: make dump_chip_info() static

The function dump_chip_info() is only used in rtl8188e_hal_init.c.
Make it static to reduce the driver object file size by 281 bytes.

before:
  text    data     bss     dec     hex filename
530606   43897    7072  581575   8dfc7 drivers/staging/r8188eu/r8188eu.o

after:
  text    data     bss     dec     hex filename
530405   43817    7072  581294   8deae drivers/staging/r8188eu/r8188eu.o

Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220724182520.7794-1-straube.linux@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>