RDKCOM-3373: RDKBDEV-1308: make local functions and variables static
RDKCOM-3373: RDKBDEV-1308: make local functions and variables static

Reason for change:
make local functions and variables static in webpa_interface.c
Test Procedure: Sanity.
Risks: None.
Signed-off-by: Andre McCurdy <armccurdy@gmail.com>

(cherry picked from commit ff60b5d95fc7e96c5e4629728ecbe6e147d62b2c)
Change-Id: Ic09a125a4256c373e8ac5867851c4aa5056f269f

rdkcmf/rdkb-CcspLMLite,rdkcmf/rdkb-CcspLMLite,rdkcmf/rdkb-CcspLMLite