sasuke : tune usb_eq on port 1
sasuke : tune usb_eq on port 1

add function to tune usb_eq_rx

BUG=b:176566398
BRANCH=None
TEST=make -j BOARD=sasuke
     update ec and check usb eq register

Signed-off-by: YongBeum.Ha <0375183cfb575c7cdd5cfe73f9fcd260a8810df7@samsung.corp-partner.google.com>
Change-Id: Ia8a7b1ac7c7946c9c2b9be18c3b625170ed1fc2a
Signed-off-by: YongBeum.Ha <0375183cfb575c7cdd5cfe73f9fcd260a8810df7@samsung.corp-partner.google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2607964
Reviewed-by: Diana Z <cb2016afc7183e5356c690dc63b4ba817470501a@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec