ARM: prima2_defconfig: enable build for hwspinlock

This patch enables hardware spinlock driver for CSRatlas7 platforms.

Signed-off-by: Barry Song <Baohua.Song@csr.com>
diff --git a/arch/arm/configs/prima2_defconfig b/arch/arm/configs/prima2_defconfig
index a9c1c33..7cc8e8e 100644
--- a/arch/arm/configs/prima2_defconfig
+++ b/arch/arm/configs/prima2_defconfig
@@ -50,6 +50,7 @@
 CONFIG_DMADEVICES_DEBUG=y
 CONFIG_DMADEVICES_VDEBUG=y
 CONFIG_SIRF_DMA=y
+CONFIG_HWSPINLOCK_SIRF=y
 # CONFIG_IOMMU_SUPPORT is not set
 CONFIG_EXT2_FS=y
 CONFIG_MSDOS_FS=y