usb: qmp: phy: Remove QMP phy rev2 related configuration

qmp_override_pll_rev2 and qmp_override_sysclk related QMP PHY
configuration was added for pre-release silicon of QMP PHY revision
2 only. These overrides are no longer required for latest platform
and can be removed.

Change-Id: I6ec45becf1b6bc92fa17144337752ed796f1b082
Signed-off-by: Mayank Rana <mrana@codeaurora.org>