rollback: rollback region must be unlocked in order to erase it
rollback: rollback region must be unlocked in order to erase it

BRANCH=none
BUG=b:151105339, b:155229277
TEST=Compile and flash "rollback" test on dragonclaw with region 0
     On console: "runtest"
     => Reboots with "Data access violation, mfar = 8020000"
        => PASS
TEST=Compile and flash "rollback" test on dragonclaw with region 1
     On console: "runtest"
     => Reboots with "Data access violation, mfar = 8040000"
        => PASS
TEST=Compile and flash "rollback" test on dragontalon with region 0
     On console: "runtest"
     => Reboots with "Data access violation, mfar = 80c0000"
        => PASS
TEST=Compile and flash "rollback" test on dragontalon with region 1
     On console: "runtest"
     => Reboots with "Data access violation, mfar = 80e0000"
        => PASS

Signed-off-by: Tom Hughes <fc5c12f30a5ed2baa0581f44ee14ad1eb7b20d83@chromium.org>
Change-Id: I1cf42fec99fa08932c2accc4604e829aaefe076f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2207998
Tested-by: Yicheng Li <77a205905d8955597c069555e9569c30512f6bd8@chromium.org>
Reviewed-by: Jett Rink <9d4aef0593e6843318d99df31597fb6153b89787@chromium.org>

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