garg: reduce flash usage
garg: reduce flash usage

BUG=none
BRANCH=firmware-octopus-11297.B
TEST=make BOARD=garg

Signed-off-by: Zick Wei <3d0b14a1e83601e71d11cd2c38ee93ff1dbbc737@quanta.corp-partner.google.com>
Change-Id: I80bd23049912d9fb00045c2d36bfca2d88c32ede
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3640830
Reviewed-by: Henry Sun <26cd8a0b26a8449e909dff5211a18ba277320ec2@google.com>
Commit-Queue: Henry Sun <26cd8a0b26a8449e909dff5211a18ba277320ec2@google.com>
Reviewed-by: Devin Lu <052fe648504800b810f29702ef4f3db83fad68bf@quantatw.com>

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