ARM: fix build errors caused by selection of errata 798181

Several configurations are selecting errata 798181 without SMP
being selected.  This causes a warning from Kconfig:

warning: (ARCH_HIGHBANK && ARCH_KEYSTONE && SOC_OMAP5 && ARCH_TEGRA_114_SOC) selects ARM_ERRATA_798181 which has unmet direct dependencies (CPU_V7 && SMP)

The dependencies are compile time dependencies; select violates these,
resulting in:

arch/arm/kernel/built-in.o: In function `setup_processor':
psci.c:(.init.text+0x808): undefined reference to `erratum_a15_798181_init'

at build time.  Fix this by fixing the select statements for Tegra and
Highbank.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-highbank/Kconfig

@@ -8,7 +8,7 @@ config ARCH_HIGHBANK
 	select ARM_AMBA
 	select ARM_ERRATA_764369
 	select ARM_ERRATA_775420
-	select ARM_ERRATA_798181
+	select ARM_ERRATA_798181 if SMP
 	select ARM_GIC
 	select ARM_TIMER_SP804
 	select CACHE_L2X0

arch/arm/mach-tegra/Kconfig

@@ -54,7 +54,7 @@ config ARCH_TEGRA_3x_SOC
 config ARCH_TEGRA_114_SOC
 	bool "Enable support for Tegra114 family"
 	select HAVE_ARM_ARCH_TIMER
-	select ARM_ERRATA_798181
+	select ARM_ERRATA_798181 if SMP
 	select ARM_L1_CACHE_SHIFT_6
 	select PINCTRL_TEGRA114
 	help