ARM: multi_v7_defconfig: update MFD_RK808 name

MFD_RK808 got split into an I2C and SPI part named MFD_RK8XX_I2C and
MFD_RK8XX_SPI. Since there are no known ARMv7 boards using the SPI
connected RK8XX chips (which are new), it is enough to just enable
the I2C option.
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Fixes: c20e8c5b ("mfd: rk808: Split into core and i2c")
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/configs/multi_v7_defconfig

@@ -596,7 +596,7 @@ CONFIG_MFD_CPCAP=y
 CONFIG_MFD_PM8XXX=y
 CONFIG_MFD_QCOM_RPM=y
 CONFIG_MFD_SPMI_PMIC=y
-CONFIG_MFD_RK808=y
+CONFIG_MFD_RK8XX_I2C=y
 CONFIG_MFD_RN5T618=y
 CONFIG_MFD_SEC_CORE=y
 CONFIG_MFD_STMPE=y