ma77759_charger: log changes to ->ext_bst_mode

the gpio is used during the BPP_RX->BPP_RX+OTG usecase to change
EXT_BOOST_MODE in TPS61372

Bug: 175706836
Test: enable log, check BPP_RX->BPP_RX+OTG
Signed-off-by: AleX Pelosi <[email protected]>
Change-Id: I9eabfcff504d80a4b0919bf750aaf045f516e734
1 file changed