ARM: tegra: Enable CPUFREQ userspace governor

Enable the CPUFREQ userspace governor in the tegra_defconfig so that
we can test CPUFREQ with the userspace governor with this configuration
on 32-bit Tegra devices.
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/configs/tegra_defconfig

@@ -23,6 +23,7 @@ CONFIG_ZBOOT_ROM_BSS=0x0
 CONFIG_KEXEC=y
 CONFIG_CPU_FREQ=y
 CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
+CONFIG_CPU_FREQ_GOV_USERSPACE=y
 CONFIG_CPUFREQ_DT=y
 CONFIG_CPU_IDLE=y
 CONFIG_ARM_TEGRA_CPUIDLE=y