qcacmn: Fix wmissing errors in shadow_register code

hif_prepare_hal_shadow_register_cfg and hif_print_hal_shadow_register_cfg
needed to be declared static after enabling "Werror=missing-prototypes"

Change-Id: I3682436edb7bcb3ee02f1c4037aefc82863c0ec5
CRs-Fixed: 1113131
1 file changed