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>

arch/arm/configs/prima2_defconfig

@@ -50,6 +50,7 @@ CONFIG_DMADEVICES=y
 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