power: qpnp-smbcharger: do not float DP/DM lines during QC3.0 detection

Currently, we request USB PHY to float DP/DM lines in usbin_uv
handler whenever USBIN_UV and SRC_DET bits are not set during
a charger insertion. This is to help with charger to run APSD
on DP/DM lines without any interference from USB PHY.

Eventually during QC3.0 detection, we run fake removal and
insertion in between. During this sequence, we disable APSD in
charger as well thereby floating DP/DM lines for a period of
~800ms. On some charger adaptors, this is detected as a different
charger type failing QC3.0 detection and also failing to operate
in QC2.0 mode.

Fix this by setting DP to 0.6V and DM to floating after fake
removal and before disabling APSD. Also, do not request USB PHY
to float DP/DM lines again during fake insertion.

CRs-Fixed: 1006776
Change-Id: I3a9f2ef71b657b3926ccd2325585c9b2a4edead9
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>