Charger: Create charger driver structure

With upcoming boards which use multiple charger chips, the EC codebase
needs to be changed to assume chargers may have different I2C ports.
This commit creates the driver structure and wrapper functions, which
for now are hard-coded to chip 0 for equivalent behavior with previous
code.  A general charger config is created for all boards in charger.c
for now, which uses the build information to fill in the structure.

All boards will default to defining CONFIG_CHARGER_SINGLE_CHIP, which in
turn defines a CHARGER_SOLO which can be used by drivers which have code
that needs to determine charger numbers.  For boards which have multiple
chips, they may undefine this config and should generate build errors if
their driver is still using the hardcoded charger reference of
CHARGER_SOLO.  Older drivers may continue using CHARGER_SOLO in
non-static functions until they're needed in a multiple charger board.

For boards which may be supporting different I2C configurations for the
charger over board versions, they may define
CONFIG_CHARGER_RUNTIME_CONFIG to fill in these fields after boot.

BRANCH=none
BUG=b:147672225
TEST=builds, chargers on hatch and octopus work

Change-Id: I390ede494226252e512595c48099fa1288ffe93e
Signed-off-by: Diana Z <dzigterman@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2008451
Reviewed-by: Jett Rink <jettrink@chromium.org>

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