cpufreq: omap: Build driver by default for ARCH_OMAP2PLUS

When building the mult_v7_defconfig, ARM_TI_CPUFREQ doesn't get enabled
evenwhen ARCH_OMAP(3|4) is selected. Build ARM_TI_CPUFREQ by default for
ARCH_OMAP2PLUS.
Signed-off-by: NAnders Roxell <anders.roxell@linaro.org>
Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org>

drivers/cpufreq/Kconfig.arm

@@ -317,6 +317,7 @@ config ARM_TEGRA186_CPUFREQ
 config ARM_TI_CPUFREQ
 	bool "Texas Instruments CPUFreq support"
 	depends on ARCH_OMAP2PLUS
+	default ARCH_OMAP2PLUS
 	help
 	  This driver enables valid OPPs on the running platform based on
 	  values contained within the SoC in use. Enable this in order to