i2c/smbus_eeprom: Add feature bit to SPD data

i2c/smbus_eeprom: Add feature bit to SPD data

Add the differential clock input feature bit to the generated SPD
data. Most guests don't seem to care but pegasos2 firmware version 1.2
checks for this bit and stops with unsupported module type error if
it's not present. Since this feature is likely present on real memory
modules add it in the general code rather than patching the generated
SPD data in pegasos2 board only.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-Id: <19d42ade295d5297aa624a9eb757b8df18cf64d6.1626367844.git.balaton@eik.bme.hu>
Acked-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>