ARM: imx_v6_v7_defconfig: Enable the PSCI CPUidle driver

Enable the PSCI CPUidle driver to replace the functionality
previously provided by the generic ARM CPUidle driver.

Link: https://lore.kernel.org/r/20190814125239.6270-3-lorenzo.pieralisi@arm.comSigned-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/configs/imx_v6_v7_defconfig

@@ -60,6 +60,7 @@ CONFIG_ARM_IMX6Q_CPUFREQ=y
 CONFIG_ARM_IMX_CPUFREQ_DT=y
 CONFIG_CPU_IDLE=y
 CONFIG_ARM_CPUIDLE=y
+CONFIG_ARM_PSCI_CPUIDLE=y
 CONFIG_VFP=y
 CONFIG_NEON=y
 CONFIG_PM_DEBUG=y