sasuke : disable alternative setting for GPIOB4/GPIOB5
sasuke : disable alternative setting for GPIOB4/GPIOB5

Enable pull-down of GPIOB4 & GPIOB5.
When I2C function is enabled,
the pull-down option for GPIOB4,GPIOB5 is not work.
So alternative setting for these GPIOs must be cleared.

BUG=b:184914946
BRANCH=None
TEST=make -j BOARD=sasuke

Signed-off-by: YongBeum.Ha <0375183cfb575c7cdd5cfe73f9fcd260a8810df7@samsung.corp-partner.google.com>
Change-Id: I3d125e844816f0a7c07cb0b166390e7131100e6e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2822277
Reviewed-by: Diana Z <cb2016afc7183e5356c690dc63b4ba817470501a@chromium.org>
Commit-Queue: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>
Tested-by: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>

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