ite: WORKAROUND reduce data SRAM to 8kB
ite: WORKAROUND reduce data SRAM to 8kB

On the IT8380, we should be able to map 16kB of SRAM to use as data
memory (aka DLM), but sometimes the 2 top 4k pages seem to be
mapped differently (ie not to SRAM, they do not retain writes ...).
As we have no documentation on that topic, for now use 8kB of DLM for now.

Signed-off-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>

BRANCH=none
BUG=chrome-os-partner:23575
TEST=build and run IT8380 dev board.

Change-Id: I4ed452f27e9c457e7ac717b82580781ca506b0d8
Reviewed-on: https://chromium-review.googlesource.com/179322
Reviewed-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>
Tested-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>
Commit-Queue: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>

coreboot/chrome-ec,fourier49/BIZ_EC,coreboot/chrome-ec,alterapraxisptyltd/chromium-ec,thehobn/ec,longsleep/ec,thehobn/ec,fourier49/BZ_DEV_EC,md5555/ec,alterapraxisptyltd/chromium-ec,longsleep/ec,fourier49/BZ_DEV_EC,md5555/ec,akappy7/ChromeOS_EC_LED_Diagnostics,mtk09422/chromiumos-platform-ec,fourier49/BZ_DEV_EC,md5555/ec,gelraen/cros-ec,longsleep/ec,coreboot/chrome-ec,thehobn/ec,eatbyte/chromium-ec,thehobn/ec,mtk09422/chromiumos-platform-ec,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,gelraen/cros-ec,eatbyte/chromium-ec,alterapraxisptyltd/chromium-ec,longsleep/ec,akappy7/ChromeOS_EC_LED_Diagnostics,fourier49/BIZ_EC,md5555/ec,alterapraxisptyltd/chromium-ec,coreboot/chrome-ec,eatbyte/chromium-ec,fourier49/BIZ_EC,akappy7/ChromeOS_EC_LED_Diagnostics,mtk09422/chromiumos-platform-ec,gelraen/cros-ec,fourier49/BZ_DEV_EC,akappy7/ChromeOS_EC_LED_Diagnostics,gelraen/cros-ec,fourier49/BIZ_EC,coreboot/chrome-ec,eatbyte/chromium-ec,mtk09422/chromiumos-platform-ec