clk: Add TI-Nspire clock drivers

This patch adds a basic clock driver for the TI-Nspire calculator
series.

Changes from v1:
* Removed filename in header comment
* Removed unnecessary #undef EXTRACT statement

Signed-off-by: Daniel Tang <dt.tangr@gmail.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
[mturquette@linaro.org: fixed $SUBJECT and changelog max width]
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 3a26115..f51b52b 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -13,6 +13,7 @@
 obj-$(CONFIG_ARCH_BCM2835)	+= clk-bcm2835.o
 obj-$(CONFIG_ARCH_NOMADIK)	+= clk-nomadik.o
 obj-$(CONFIG_ARCH_HIGHBANK)	+= clk-highbank.o
+obj-$(CONFIG_ARCH_NSPIRE)	+= clk-nspire.o
 obj-$(CONFIG_ARCH_MXS)		+= mxs/
 obj-$(CONFIG_ARCH_SOCFPGA)	+= socfpga/
 obj-$(CONFIG_PLAT_SPEAR)	+= spear/