msm: pcie: cache PCIe current link speed
Add support to cache PCIe current link speed after each link
training and Gen switching. This will help check users check
which Gen speed the link was operating at all times.
Change-Id: I64487dff10cf9c5a6dc87dad42239c7cd119763c
Signed-off-by:
Tony Truong <truong@codeaurora.org>
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