staging: rtl8192e: fix CamelCase variables

Fix checkpatch warnings for variables: LinkCtrlReg, DeviceID,
RevisionID, IrqLine.

Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Signed-off-by: Valentin Vidic <vvidic@valentin-vidic.from.hr>
Link: https://lore.kernel.org/r/20220925123810.2492865-1-vvidic@valentin-vidic.from.hr


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