power_supply: Add SOH, ESR_Actual and ESR_Nominal properties

Add State of Health (SOH) property which indicates battery state
of health based on ESR and learned capacity.
Also add ESR_Actual and ESR_Nominal for SOH calculations.

CRs-Fixed: 2259538
Change-Id: Icefa262627296b5dc232ea706a8253cb854288b6
Signed-off-by: Vamshi Krishna B V <vbv@codeaurora.org>