arm64: defconfig: Enable clock driver for ROHM BD718x7 PMIC

The ROHM BD718x7 PMIC is present on many designs with i.MX 8M SoCs.
Enable the bd718x7 clock driver which provides PMICs 32 kHz clock.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

arch/arm64/configs/defconfig

@@ -827,6 +827,7 @@ CONFIG_COMMON_CLK_FSL_SAI=y
 CONFIG_COMMON_CLK_S2MPS11=y
 CONFIG_COMMON_CLK_PWM=y
 CONFIG_COMMON_CLK_VC5=y
+CONFIG_COMMON_CLK_BD718XX=m
 CONFIG_CLK_RASPBERRYPI=m
 CONFIG_CLK_IMX8MM=y
 CONFIG_CLK_IMX8MN=y