pp: split fsm state in two
pp: split fsm state in two

In preparation to conveying the PP state to gsctool let's split the
'PP_DETECT_IN_PROGRESS' physical presence FSM state in two:

 - PP_DETECT_AWAITING_PRESS, a state when user physical presence
   indication is expected

 - PP_DETECT_BETWEEN_PRESSES, a state when the previous indication was
   accepted, but the next one is not yet required.

The code is modified to accept the disjunction of the twp new states
as the old PP_DETECT_IN_PROGRESS state.

BRANCH=cr50
BUG=b:62537474
TEST=successfully took Eve through 'ccd open'

Change-Id: I0d229f2f8beeec01ea2a9106b0cbc3f9801ff479
Signed-off-by: Vadim Bendebury <5515d6d2d0829cbe0dd0dcf2094aaded06d58514@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/860997
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>
Reviewed-by: Mary Ruthven <81380f3403fed74252e92df3ed012a1819ec6296@chromium.org>

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