Volume curve for snow
Volume curve for snow

It makes max volume at 3dB which Snow speaker's max tolerence
To protect speaker broken in max volume, this CL will helpful

BUG=chrome-os-partner:13211
TEST=check i2c value 0x18 when you go into max volume
     i2cget -y -f 7 0x11 0x67
     check i2c value 0x5 when you go into min volume
     check using every step(0x5~0x18) when you volume control

Change-Id: I7edecdb56597696c577656ebf864fa8c0562b944
Reviewed-on: https://gerrit.chromium.org/gerrit/31643
Reviewed-by: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>
Tested-by: Wonjoon Lee <b961a80bc33bbc19346c547d1234eeb868c7ae74@samsung.com>
Commit-Ready: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>

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