Staging: rtl8192e: Fix Sparse Warning for Static Declarations in rtl_core.c

This patch fixes the following sparse warning in rtl8192e/rtl_core.c-

drivers/staging/rtl8192e/rtl8192e/rtl_core.c:58:5: warning: symbol 'hwwep' was not declared. Should it be static?
drivers/staging/rtl8192e/rtl8192e/rtl_core.c:588:5: warning: symbol 'WDCAPARA_ADD' was not declared. Should it be static?
drivers/staging/rtl8192e/rtl8192e/rtl_core.c:2695:13: warning: symbol 'rtl8192_interrupt' was not declared. Should it be static?

Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com>
Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>