riscv: sifive: fu740: kconfig: Enable support for Opencores I2C controller

Enable the Opencores I2C controller on FU740
Signed-off-by: NZong Li <zong.li@sifive.com>
Reviewed-by: NLeo Yu-Chi Liang <ycliang@andestech.com>

arch/riscv/cpu/fu740/Kconfig

@@ -35,3 +35,5 @@ config SIFIVE_FU740
 	imply SIFIVE_OTP
 	imply DM_PWM
 	imply PWM_SIFIVE
+	imply DM_I2C
+	imply SYS_I2C_OCORES

board/sifive/unmatched/Kconfig

@@ -47,5 +47,6 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	imply PHY_MSCC
 	imply SYSRESET
 	imply SYSRESET_GPIO
+	imply CMD_I2C
 
 endif