staging: rtl8192e: Use BIT() instead of << for bit field MSR_LINK_MASK

Use commonly used BIT() macro to define MSR_LINK_MASK. Equation is
not accepted by checkpatch because of missing spaces. Therefore line
needs to change anyhow.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/20230208185645.GA14681@matrix-ESPRIMO-P710


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