smb-lib : Fix incorrect VALID_INPUT_POWER_SOURCE_BIT check

In smblib_get_prop_usb_online() and smblib_get_prop_dc_online(),
used incorrect VALID_INPUT_POWER_SOURCE_BIT check. Now change
to VALID_INPUT_POWER_SOURCE_STS_BIT check.

Change-Id: I70489775b2a99afff8b26366758834a98b1ffb30
Signed-off-by: Vic Wei <vwei@codeaurora.org>
CRs-Fixed: 1102132