power: smb5: Change default WLS FCC_MAIN vote to 800 mA

Since for VBATT designs, the main charger is allocated only 800 mA,
reflect that in the default vote of wireless charging.

Change-Id: Ic436905b0449ff511989eab63cfc519c37046b66
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>