mach-snapdragon: always select SYSRESET_PSCI for ARCH_SNAPDRAGON

Since removing reset_cpu() in mach-snapdragon, all Qualcomm platforms
now depend on CONFIG_SYSRESET and will fail to build without it.

Move the dependency from qcom_defconfig to kconfig so that we use
SYSRESET for all platforms.

Fixes: 61a1a1b8ca73 ("mach-snapdragon: use PSCI sysreset driver")
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index cf08fe6..32b80da 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1117,6 +1117,8 @@
 	select OF_BOARD
 	select SAVE_PREV_BL_FDT_ADDR
 	select LINUX_KERNEL_IMAGE_HEADER if !ENABLE_ARM_SOC_BOOT0_HOOK
+	select SYSRESET
+	select SYSRESET_PSCI
 	imply OF_UPSTREAM
 	imply CMD_DM