flash: Allow currently active regions to be modified
flash: Allow currently active regions to be modified

This patch allows chips which run code in RAM to erase or write
regions even if they're active.

BUG=b:77306460
BRANCH=none
TEST=flashrom -p ec -w /tmp/ec.bin on Fizz

Change-Id: Ib536b250dde78283513acb942507c67da0a6f622
Signed-off-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/997022
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>
Reviewed-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>

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