ipq806x: fix pcie tx termination offset

ipq806x: fix pcie tx termination offset

According to GPL tarballs and QSDK related branch tx termination
offset for ipq8064 SoC version >= 2.0 should be equal to 0 and
not 7.

https://github.com/paul-chambers/netgear-r7800/blob/master/git_home/linux.git/sourcecode/arch/arm/mach-msm/board-ipq806x.c#L1682-L1685

Fix this.

Signed-off-by: Pavel Kubelun <be.dissent@gmail.com>
[slh: rebase for kernel v4.14 as well]
Signed-off-by: Stefan Lippers-Hollmann <s.l-h@gmx.de>
(cherry picked from commit fbedc2213c19023bb4ec4ed7bd71908501aaf6d1)