ec_memmap: Add Power source to EC MEMMAP region
ec_memmap: Add Power source to EC MEMMAP region

For Intel Dynamic Tuning Platform Power Participant,
power source(PSRC) is one of the object. This PSRC
corresponds to an 8 bit value, representing the current
power source as lower nibble and PD sequence number as
upper nibble. PSRC information must be updated at EC
and must be read by AP. As there is only a read request
from AP, this component could be present in EC_MEMMAP
region. Document #doc-626708, has more details.

BUG=b:205928013
BRANCH=None
TEST=make build_cros_ec_commands

Signed-off-by: poornima tom <33af2d34e25b2ae954dbdd64afa51fe7af7609b7@intel.com>
Change-Id: Iebfb305e95e647cbe3d83a351765b7711070981e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3545778
Reviewed-by: Sumeet R Pawnikar <8a166f127db24fe02eee6e5e7b86af62c4ae4784@intel.com>
Reviewed-by: Vijay P Hiremath <006c712879a3af08bfdb5c2b8491a8b2d5fd73cd@intel.com>
Reviewed-by: Tim Wawrzynczak <86444811eee8c2cb29e29a251d7a069e64ccc665@chromium.org>

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